No LTE, 3G, 4G symbols.

Hello, I have had this problem once, but it seemed to resolve it's self in a decent time, if that helps.

What seems to happen is I will have somewhat full connection, with the upper left hand corner of my iPhone reading a few dots and "AT&T" with the LTE service. Note, the status of the connection strength (dots in the upper left corner) does not seem to change the outcome. Next, the LTE symbol will disappear completely and I will be left without any way to browse the internet, or use imessage. All messaging will be restricted to SMS. The upper left hand cell service will just read a few dots and AT&T. There is no "3G", "4G", or "LTE" following my carrier. Safari and other browsers state that I am not connected to the internet, and all services requiring cell, such as imessage, ask me to turn on cell services.

I have a iPhone 5 (A1428) that has given me trouble in the past. The problem does seem to fix itself after a 2 week period, but I was wondering if there is an easier way.

Thank you for all your time and support,

-Ramsey