Good evening Paul. No, no temperature changes. I played by pressing the keys and after a while started to make those typical clicks of the ignition as I said in the previous post.Pero, if it may be relevant, I placed the phone on the ground above the power supply. Maybe it will depend on this? .. I do not know ... because then after several attempts turning on and off, it has started to work properly. Today I turned it on and off twice, and I used it, it did not give me problems.
To me, it sounds like a power problem. First and foremost, was the power supply hot to the touch? If so, there is some sort of overload taking place, if not, then my next guess would be a cold solder joint on the power supply connector inside the keyboard. This would require the services of an authorized service center to take care of. Because these printed circuit boards are soldered by machines, only an initial check for conductivity is performed as they come off the machine, then the boards are placed in the keyboard by hand, screwed in place and the connectors are connected to the various printed circuit boards by hand. Sometimes, those connections are not as solid as they need to be, and some work themselves lose during transportation.
Hope this helps,
Gary