Default Signal drop

Hey I have a big problem, I have an AT&T htc 8x and it have signal drop problems. I have a temporary fix, I make a hard reset and it fix for a couple days. It have the lastest version 8.1, i really love this phone but this problem its make me mad. Thanks for ur help guyz!! Sorry for my english!

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Devices:
  • HTC One X
  • HTC 8X
  • Nexus 7
  • Nokia 520