Programming Beetle with avrdude

I'm trying to program a hex file into a Beetle and every time I do the com port goes away. I can then reset the module and program it and the port comes back but if I program it again without resetting module the com port goes away again.
This is the command I'm using to program the module.

"AVRdude\avrdude.exe" -c avr109 -P COM3 -b 1200 -n
ping 1.1.1.1 -n 1 -w 200 >NUL
"AVRdude\avrdude.exe" -c avr109 -P COM4 -b 57600 -p AT%2 -U flash:w:%1:i