Network problem on Lg p500 topic

I have been facing a problem with network in almost every telecom service provider. It seems that there is a problem with my phone.
The signal of the phone disappears suddenly and comes back at its own time. It's really annoying, I can't use the at all. I'm using Stock tom gb with tagb kernel with int2ext script.

Sent from my LG-P500 using xda app-developers app