IOS 8.1 Erratic Connection to Phone Network and keyboard freezing iPhone 5S

I have an iPhone 5s running on AT&T's network with IOS 8.1 running.  The phone has erratic connection to the cellular network.  I worked with Apple tech support and they sent me a new phone, but I still had the problem.  Resetting network settings works for a few hours and I have to do it again.  The keyboard also freezes as the phone connects and loses connection continuously.
In complete desperation I erased all content and settings and refrained from doing a backup.  I'll let you know if it works.  Has anyone else solved this issue? It's concerning that this wasn't fixed in IOS 8.1.

If the new device was problematic, then I would suggest contacting AT&T to check on a new SIM, or if there is a tower problem in your area. The other problem could be something in the backup, but you have addressed that now with the restore as new. I have not seen anyone that I am familiar with here experiencing this problem. I would not determine it is an iOS problem since there are a number of other reasons for this problem.

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