Default Signal Unstable After IMEI Restore

Yesterday after an AOSP mishap I lost my IMEI. I ODIN'd back to stock and repaired my IMEI with QPST. I'm now rooted and running a debloated TW ROM.

My issue is with my 4G/LTE signal. I will sometimes hold a strong LTE signal only to have it drop and come back as 1x and it does not go back. With some fiddling in the Mobile Network options such as toggling mobile data or cycling the Network Modes I can get LTE to come back only to have it drop back to 1x after some time.

What can I do to further troubleshoot this problem?

Sent from my SCH-I535 using xda app-developers app