DFR0299 mp3 player: play track in different conditions

I am trying to set up the module to play specific track in different conditions ( if command). On my project i am using arduino mega with Ethernet shield, LCD, temperature DHT22 sensor, light sensor and so on. I try to put (mp3_play (2);) command on (if) put repeats the song every 2 seconds.
for example:
if (manin >=85)//manual
{
lcd.setCursor(0, 2);
lcd.print("Mode: Manual");
}

if (manin <85 )//auto
{
lcd.setCursor(0, 2);
lcd.print("Mode: Auto ");
mp3_play (2);
}
At the beginning i have 2000ms delay for the temp sensor and LCD refresh.
I want this code to play continuous on "auto" and stop to "manual".