I would try to boot into safe mode (where 3rd party software doesn't launch) and see if you still have the problem. If this helps then you installed something that is causing the problem. It could also be a virus that you caught. In safe mode you should be able to remove anything you installed, in the case of a virus you may need to re-flash your phone.
Try to remove the sim card, SD card if installed, and then go into safe mode. You could also try to remove the battery and use just the power adapter. This would rule out a fault in those components.
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