Need Support with URM04v2

Hi! I have Arduino Mega + 3 URM04v2 in bridge and MAX485 interface on ProtoShield
First run was fully completed and all sensors work well

Than i rebild my 485 interface and system became not work correctly
i use serial3 port on Mega and change rxURM04.h

[code]#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#define printByte(args) Serial3.write(args)
#else
#include "WProgram.h"
#define printByte(args) Serial.print(args,BYTE)
#endif

#define URM04_SerialPort Serial3
#define CommMAXRetry 40
#define TriggerPin 41[/code]

Some troubles:
measurement of the distance and temperature are not stable
Please see log

Distance: 117.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 115.00; Temperature: -24.00
Distance: 115.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 111.00; Temperature: -24.00
Distance: 110.00; Temperature: -24.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 7.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 6.00; Temperature: -24.00
Distance: 8.00; Temperature: -24.00
Distance: 11.00; Temperature: -24.00
Distance: 12.00; Temperature: -24.00
Distance: 10.00; Temperature: -24.00
Distance: 11.00; Temperature: -24.00
Distance: 12.00; Temperature: -24.00
Distance: 109.00; Temperature: -24.00
Distance: 109.00; Temperature: -24.00
Distance: 110.00; Temperature: -24.00
Distance: 0.00; Temperature: 0.00
Distance: 113.00; Temperature: -24.00
Distance: 113.00; Temperature: -24.00
Distance: 254.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 118.00; Temperature: -24.00
Distance: 117.00; Temperature: -24.00
Distance: 116.00; Temperature: -24.00
Distance: 16.00; Temperature: -24.00
Distance: 15.00; Temperature: -24.00
Distance: 11.00; Temperature: -24.00
Distance: 8.00; Temperature: -24.00
Distance: 6.00; Temperature: -24.00
Distance: 4.00; Temperature: -24.00
Distance: 4.00; Temperature: -24.00
Distance: 4.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 6.00; Temperature: -24.00
Distance: 10.00; Temperature: -24.00
Distance: 9.00; Temperature: -24.00
Distance: 15.00; Temperature: -24.00
Distance: 119.00; Temperature: -24.00
Distance: 112.00; Temperature: -24.00
Distance: 114.00; Temperature: -24.00
Distance: 115.00; Temperature: -24.00
Distance: 101.00; Temperature: -24.00
Distance: 102.00; Temperature: 0.00
Distance: 6.00; Temperature: 0.00
Distance: 7.00; Temperature: -24.00
Distance: 5.00; Temperature: -24.00
Distance: 6.00; Temperature: -24.00
Distance: 5.00; Temperature: -25.00
Distance: 6.00; Temperature: -25.00
Distance: 6.00; Temperature: -25.00
Distance: 10.00; Temperature: -25.00
Distance: 10.00; Temperature: -25.00
Distance: 8.00; Temperature: -25.00
Distance: 6.00; Temperature: -25.00
Distance: 6.00; Temperature: -25.00
Distance: 6.00; Temperature: -25.00
Distance: 6.00; Temperature: -25.00
Distance: 6.00; Temperature: -25.00
Distance: 7.00; Temperature: -25.00
Distance: 8.00; Temperature: -25.00
Distance: 11.00; Temperature: -25.00
Distance: 9.00; Temperature: -25.00
Distance: 10.00; Temperature: -25.00
Distance: 11.00; Temperature: -25.00
Distance: 12.00; Temperature: -25.00
Distance: 13.00; Temperature: -25.00
Distance: 13.00; Temperature: -25.00
Distance: 13.00; Temperature: -25.00
Distance: 14.00; Temperature: -25.00
Distance: 17.00; Temperature: -25.00
Distance: 17.00; Temperature: -25.00
Distance: 18.00; Temperature: -25.00
Distance: 19.00; Temperature: -25.00
Distance: 19.00; Temperature: -25.00
Distance: 20.00; Temperature: -25.00
Distance: 21.00; Temperature: -25.00
Distance: 22.00; Temperature: -25.00
Distance: 22.00; Temperature: -25.00
Distance: 23.00; Temperature: -25.00
Distance: 25.00; Temperature: -25.00
Distance: 23.00; Temperature: -25.00
Distance: 25.00; Temperature: -25.00
Distance: 27.00; Temperature: -25.00
Distance: 26.00; Temperature: -25.00
Distance: 28.00; Temperature: -25.00
Distance: 27.00; Temperature: -25.00
Distance: 29.00; Temperature: -25.00
Distance: 31.00; Temperature: -25.00
Distance: 31.00; Temperature: -25.00
Distance: 31.00; Temperature: -25.00
Distance: 29.00; Temperature: -25.00
Distance: 33.00; Temperature: -25.00
Distance: 36.00; Temperature: -25.00
Distance: 38.00; Temperature: -25.00
Distance: 40.00; Temperature: -25.00
Distance: 40.00; Temperature: -25.00
Distance: 44.00; Temperature: -25.00
Distance: 40.00; Temperature: -25.00
Distance: 40.00; Temperature: -25.00
Distance: 43.00; Temperature: -25.00
Distance: 42.00; Temperature: -25.00
Distance: 46.00; Temperature: -25.00
Distance: 45.00; Temperature: -25.00
Distance: 46.00; Temperature: -25.00
Distance: 47.00; Temperature: -25.00
Distance: 49.00; Temperature: -25.00
Distance: 50.00; Temperature: -25.00
Distance: 52.00; Temperature: -25.00
Distance: 51.00; Temperature: -25.00
Distance: 52.00; Temperature: -25.00
Distance: 58.00; Temperature: -25.00
Distance: 58.00; Temperature: -25.00
Distance: 58.00; Temperature: -25.00
Distance: 58.00; Temperature: -25.00
Distance: 61.00; Temperature: -25.00
Distance: 29.00; Temperature: -25.00
Distance: 28.00; Temperature: -25.00
Distance: 28.00; Temperature: -25.00
Distance: 27.00; Temperature: -25.00
Distance: 27.00; Temperature: -25.00
Distance: 27.00; Temperature: -25.00
Distance: 27.00; Temperature: 25.00
Distance: 27.00; Temperature: -25.00
Distance: 27.00; Temperature: 25.00
Distance: 27.00; Temperature: 25.00
Distance: 27.00; Temperature: 25.00
Distance: 27.00; Temperature: 25.00
Distance: 27.00; Temperature: 25.00
Distance: 27.00; Temperature: 25.00
Distance: 27.00; Temperature: 25.00
Distance: 28.00; Temperature: 25.00
Distance: 33.00; Temperature: 25.00
Distance: 29.00; Temperature: 25.00
Distance: 31.00; Temperature: 25.00
Distance: 84.00; Temperature: 25.00
Distance: 86.00; Temperature: 25.00
Distance: 85.00; Temperature: 25.00
Distance: 108.00; Temperature: 25.00
Distance: 89.00; Temperature: 25.00
Distance: 90.00; Temperature: 25.00
Distance: 90.00; Temperature: 25.00
Distance: 109.00; Temperature: 25.00
Distance: 92.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 93.00; Temperature: 25.00
Distance: 92.00; Temperature: 25.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 94.00; Temperature: 0.00
Distance: 95.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 91.00; Temperature: 25.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 89.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 95.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 84.00; Temperature: 25.00
Distance: 84.00; Temperature: 25.00
Distance: 82.00; Temperature: 25.00
Distance: 81.00; Temperature: 25.00
Distance: 84.00; Temperature: 25.00
Distance: 78.00; Temperature: 25.00
Distance: 0.00; Temperature: 0.00
Distance: 77.00; Temperature: 25.00
Distance: 71.00; Temperature: 25.00
Distance: 72.00; Temperature: 25.00
Distance: 67.00; Temperature: 25.00
Distance: 66.00; Temperature: 25.00
Distance: 86.00; Temperature: 25.00
Distance: 64.00; Temperature: 25.00
Distance: 63.00; Temperature: 25.00
Distance: 63.00; Temperature: 25.00
Distance: 61.00; Temperature: 25.00
Distance: 59.00; Temperature: 25.00
Distance: 57.00; Temperature: 25.00
Distance: 57.00; Temperature: 25.00
Distance: 54.00; Temperature: 25.00
Distance: 53.00; Temperature: 25.00
Distance: 54.00; Temperature: 25.00
Distance: 0.00; Temperature: 0.00
Distance: 51.00; Temperature: 25.00
Distance: 49.00; Temperature: 25.00
Distance: 48.00; Temperature: 25.00
Distance: 50.00; Temperature: 25.00
Distance: 45.00; Temperature: 25.00
Distance: 0.00; Temperature: 0.00
Distance: 44.00; Temperature: 25.00
Distance: 40.00; Temperature: 25.00
Distance: 39.00; Temperature: 25.00
Distance: 40.00; Temperature: 25.00
Distance: 40.00; Temperature: 25.00
Distance: 35.00; Temperature: 25.00
Distance: 34.00; Temperature: 25.00
Distance: 34.00; Temperature: 25.00
Distance: 32.00; Temperature: 25.00
Distance: 30.00; Temperature: 25.00
Distance: 30.00; Temperature: 25.00
Distance: 29.00; Temperature: 25.00
Distance: 27.00; Temperature: 25.00
Distance: 25.00; Temperature: 25.00
Distance: 23.00; Temperature: 25.00
Distance: 23.00; Temperature: 25.00
Distance: 23.00; Temperature: 25.00
Distance: 21.00; Temperature: 25.00
Distance: 19.00; Temperature: 25.00
Distance: 18.00; Temperature: 25.00
Distance: 17.00; Temperature: 25.00
Distance: 16.00; Temperature: 25.00
Distance: 14.00; Temperature: 25.00
Distance: 13.00; Temperature: 25.00
Distance: 11.00; Temperature: 25.00
Distance: 10.00; Temperature: 25.00
Distance: 8.00; Temperature: 25.00
Distance: 7.00; Temperature: 25.00
Distance: 6.00; Temperature: 25.00
Distance: 5.00; Temperature: 25.00
Distance: 5.00; Temperature: 25.00
Distance: 4.00; Temperature: 25.00
Distance: 4.00; Temperature: 25.00
Distance: 3.00; Temperature: 25.00
Distance: 3.00; Temperature: 25.00
Distance: 3.00; Temperature: 25.00
Distance: 5.00; Temperature: 25.00
Distance: 8.00; Temperature: 25.00
Distance: 5.00; Temperature: 25.00
Distance: 6.00; Temperature: 25.00
Distance: 14.00; Temperature: 25.00
Distance: 13.00; Temperature: 25.00
Distance: 12.00; Temperature: 25.00
Distance: 5.00; Temperature: 25.00
Distance: 5.00; Temperature: 25.00
Distance: 4.00; Temperature: 25.00
Distance: 7.00; Temperature: 25.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00
Distance: 0.00; Temperature: 0.00

What could be wrong ? If you want I can send you the full code