5.0.1 location problem

I'm using iPhone 3gs(new bootrom) 5.0.1 which has been hacktivated....I'm using Airtel...
Problem is that whenever I use my 3g data....the signal dies many times....
and when I try to use map(gps,location services) with 3g network....d signal dies....and I cant even use It properlyy....:(((
any suggestions plz?