Hello JessK4283,
I'm sorry for any issues with your service. What kind of phone are you using and when did start having problems? It's possible that in some cases a regular 4G tower is closer than LTE tower and so it'd have a stronger signal and faster speeds, or in many cases a new SIM card resolves those kinds of issues, you can get a SIM card for free at any corporate AT&T store.
Thank you,
Dmitriy