Default Having data connection issues. Any help would be great

Hey guys. Running tasks aokp 4.4 currently but yesterday tried several other roms (both aosp and touch wiz) and this problem manifested itself on every rom i have tried (clean full wipe installs).

When on data, regardless of where I am and what I'm doing my connection will continually switch from 4g to h+ to 3g to edge. Does this totally randomly with no pattern. Then the signal will totally drop and I will be unable to do anything (make a call even) . Usually if I wait 15 seconds the the signal will come back, but only for a few minutes.

I have called att and they have done a "hard reset" of my data on their end but it didn't fix anything. Does anyone have any ideas? Maybe I should try flashing a different modem (never done this before).

This problem started around ten days ago. Nothing started it (phone wasn't dropped or anything) and I double checked to make sure the Sim card is properly seated... Which it is.

Any help would be greatly appreciated.

Sent from my SGH-I747 using XDA Free mobile app