Signal drops after getting warranty phone.

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http://forum.xda-developers.com – Hi friends pretty much looking for advice. I dropped my HTC one s and the screen had colors leaking everywhere. I had a case on and screen protector. Anyway T-Mobile sent me a replacement in the mail. I went to the store the representative activated my new SIM card. Turned the phone on and started having signal issues. The signal randomly drops and stays off both cell signal and data. It takes a long time for it to start back up. I turn on airplane mode and when I do this temporary the signal comes back then airplane displays and cuts it off. Then I turn off airplane and the signal comes back. (HowTos)