This is most likely due to an internal CR2032 battery failing inside the console which keeps the time even when the machine is unplugged from the wall. In the link provided you can see the small circular battery on the front board assembly that would need to be replaced. You can find most of these batteries at your local dollar store. I have also attached a tear down link for you to follow so you can replace this with ease. Battery Photo: https://d3nevzfk7ii3be.cloudfront.net/ig... Tear Down: Nintendo GameCube Teardown Thanks
You could try and set the phone in the fridge for 10 minutes or so to allow the metal screw and bracket to contract a little bit which might help loosen it. Then maybe the super glue trick might work, hopefully you haven’t glued the screw in place, just a thought
It is most likely the on board temp sensor. The only thing I can think of would be to disassemble everything right down to the board and do a solder re flow, by either using a heat gun to bring the board up to temperature so all the solder points re connect or you can also do this in an oven. This method is for repairing cold solder joints on the board, which could be the cause if the machine heated up enough to melt the solder and cause it to loose its contact. Try Google and search for "Solder Reflow"