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Aug 2, 2015 6:25 AM in response to JDNannaby joe_7399,Hello JDNanna,
Welcome to the Apple Support Communities!
I understand that your iPhone started unexpectedly restarting as well as displaying a couple of other issues including poor signal and not being recognized in iTunes. The first two articles below will help you troubleshoot the signal and the iPhone not showing in iTunes, while the last article addresses the restarts.
If after working through the articles the issues continue, it may be necessary to follow the link in the last article and contact Apple Support.
If you can't connect to a cellular network or cellular data - Apple Support
If you don't see your connected device in iTunes for Mac - Apple Support
If your iOS device restarts or displays the Apple logo unexpectedly - Apple Support
Have a great day
