Default [Q] Modem Problem?

Hello. I have a T-mobile Samsung galaxy s 4. I did the 4.3 OTA update. My baseband is now M919UVUEMK2. My problem is that while using LTE i'm always getting 1 bar of service ~ -113dBm. Only when switching to 2G i get full bars. I've searched for a while now getting different suggestions but nothing works. Is this normal with the latest OTA? Is there a fix? Any help would be appreciated. Thanks.