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Help Black Screen

So I just had my lcd replaced, as I had dropped it and the screen cracked. I have the S3 SPH L710 through Sprint. When I'm at home, the phone works great, no problems. The issue arises whenever I am out. It seems whenever I have to use 3/4G, the phone works for a bit, then cuts to black. I then have to wait a few seconds, and then the phone will turn on briefly again before going black again.

If its a heating issue, then why does it work fine at home?

I'm going to reset the phone to see if its a software problem. Otherwise, I have no clue what the problem may be.

PS. That small antenna that runs on the right side (looking with back removed, is that for wifi or mobile data? )

Any help/tips/suggestions would be much appreciated.
 
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