Time is changing during the night to 6 or more hours in advance

We understand the importance of needing the time on your device to be accurate @9ironswinger.

We would suggest you to try these steps:

• Open Settings, and click on the search tab. Type in, set time, and select set time under General management > Date and Time. From here please turn on the automatic date and time off and selected your time zone.
  If your symptom still persists I would recommend testing your device while in safe mode. You can do so by doing the following:
• Press and hold the power button until power off, restart, and emergency mode show on screen
• Tap and hold on the power off option until it changes to safe mode, then tap on safe mode.
• The phone will then reboot into safe mode. You will be able to check that it is by a grey transparent box in the bottom left of the screen that says safe mode.

In case this still persists, we would suggest you to contact us (http://sm.att.com/acc927e5) to assist you further.

Thank you,
Vanshi, AT&T Community Specialist.