[Solved] Xiaomi Mi 9 (6GB, 64GB ROM): Camera Self-Start, Navigation Issues, Turns Off & Won't Restart

Hello everyone. I have a telephone
Brand: Xiaomi
Model: Mi9
Firmware: I am now unable to provide it because it is lying
I will only add that this is Miui10, because after a hard reset.


I have a xiaomi mi 9 dual sim 6gb ram, 64 GB Rom from the play salon for a year.
The problem started showing up a month and a half ago. It started with the camera self-starting and turning it off so fast that the app refused to obey and an error popped up. Then came the navigation, which started to show a random location in the distance of 300 m.
Once the charged phone turned off and stopped responding to emergency start, all chargers and all sockets. After one / two days, the phone managed to start up with the battery low. The situation happened many times, so today I replaced the batteries with a new one purchased from the original xiomi service. Unfortunately, nothing has changed ... The phone responds in the same way. After replacing the battery, it started up nicely, so I even stuck it together. After a dozen / several dozen minutes, it turns off again.
Unfortunately, the guarantee is no longer available.
Do you have any idea?

Detach the display and try to turn on, write if the phone responds.

Unfortunately, no changes. Still not responding.

Ps, I think I remembered an important thing. Before the symptoms appeared, the phone was driving in the car on a magnetic holder ... could that have something to do with it? Could it have any consequences, and if so, what?

An interesting thing happened. The phone has already been practically written off, but I decided to connect it to the computer and see what happens. The phone started to charge and turned on by itself. It was able to charge under the mains charger in this way after it fell, but not recently. Interestingly, the side tape with the power button does not work completely. Only vol up works. Probably the powera button was responsible for the automatic shutdown, but could it discharge the phone while it was lying? In addition, I have the inductive charging coil removed. The phone has been flashing since noon yesterday. I wrote it because it might be useful to someone in the future. Regards.