I upgraded to IOS 8 this weekend and have several new problems:

1. Battery Drains in 4 hours
2. I never see LTE any more, just 3G
3. When using iPhone 5s as a PersonalHotspot for my IOS 8 iPad Air, the phone locks up and the wirless signal drops if the phone goes dormant and is revived by touching the screen.

http://www.apple.com/support/iphone
This is where you need to address that device issue. Apple updated your iOS to iOS 8 not Verizon.
Or walk into a Apple Retail Store and have them look at it.
Good Luck

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