SGH-G600 Help please. no network randomly

[issayatim]

my phone was restarting randomly by itself or when i was writing messages. i check some websites and i found reset codes. i used the #*7337# and my imei was reset to zeros.

i took the phone to a service shop and they restored my original imei. i checked it with the #*06# and it is the same as the lable behind the batter.

before the #*7337# the mobile was ok besides the restarting but now it can not find networks. but if i leave couple of hours on, it finds the network and works for a while and then it says no network found.


i flashed it with new firmware but it is still the same.
i tried G600CBGK2 and G600XEGL1 firmware but they didn't solve the problem.

Please advice

thanks,