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I still have not found anything that fixes it. I am going to have to send the camera in for repair I think.

WiFi and Bluetooth are definitely both disabled, and the camera on/off switch is off. The camera will switch off as normal, including the sensor cleaning. Then it sometimes takes several minutes, but the camera then turns on with the switch still in ...

Well, the new battery solution didn't last. The camera still turns itself back on with the new battery, so this is not the problem.

I am not 100% certain yet, but I think this may be a symptom of the LP-E17 battery starting to die. I had exactly the problem descibed. I tried everything, changing firmware, changing lenses, reseting the camera (YUCK!) formatting and changing the SD...