Why does restart phone keep coming up on my HTC One M8?

[AC Question]

Why does restart phone keep coming up On my HTC One M8

A few days ago, my HTC One M8 came up with a little box on the screen saying "to restart the phone, Press the power button and the volume down button for 10 secs". I had not done anything to the phone so i went to swipe it away and it would not. I could use any apps or panels under the message but the box with the message stayed there.

Then another panel came up with the "shut down, restart and airplane mode" when i did not even press the power button to get to that panel. It would then keep switching between the power saver screen (blank screen) then back to the "airplane mode" box randomly.

Ive tried to factory reset the phone and clear out the cache but to no avail. I thought it might have been a virus...managed to put a virus checker on but found nothing.

Please help...or is the phone knackered?

Thx

Joe

 

[B. Diddy]

Welcome to Android Central! There might be a problem with the Power button. If the phone keeps thinking the Power button is being pressed, that Power Off dialog box will keep coming up. You may want to bring it to a repair shop for them to inspect it.

 

[DJ Grand Theft Audio]

This was happening to my old M8. It turned out that the power button became faulty. Had my phone replaced under warranty.

Now I'm really worried about the power button going again so I use tap to wake to wake the phone. I've installed screen off and lock so I don't have to press the power button every time. I've put a case on that covers the power button so that dust doesn't go in there. Extreme measures I know but I want this phone to last.