[Q] need urgent help topic

Hello

I have flashed CM 12 custom rom by pawtip on my GT-I9082 with full instructions

I did -:
Placed the from package In my SD card
Went to CWM recovery
Wipe data/factory reset
Wiped cache
Install zip from card--selected zip and flashed
Then flashed gapps package
Wipe dalvik cache
Wipe cache
REBOOT

ENJOYED THE ROM AT FIRST BUT THEN I PUT MY CARRIER SIM IN PHONE.
INTERNET ISN'T WORKING .THEN I DISABLED DUAL SIM AND STILL 3G ISN'T WORKING EVEN 2G WORKS FOR 10 MIN.AND THEN THE internet sign is showing but net not working at all
..I rebooted again tried and 2g works for 10min and again same result.

Then I downloaded GENNEXT ROM PACKAGE..
Tried to flash it with full carefully instructions.

But when rebooted its still same CM12 ROM ..GENNEXT NOT FLASHED
TRIED AGAIN AND STILL SAME CM12 from
..

What should I do pls help pls pls pls

Regards
RD8

THANX