Question signal problems

i have reseption problems..
had them with ics official too...
when the phone stay in black screen for some time it has no signal...like it falls to sleep and many times doesn't wake up for iven half an hour when i have unlock it..
now running ROM{4.1.2 CyanogenMod 10 {Unofficial} v3.0}

ps:i didn't have this problem with stock rom...2.2