My Surface has an issue with the power button; it doesn't make contact properly. To turn it on, I have to try clicking it often for more than 10 minutes before it powers on.
Fixing it is as expensive as buying a new one. I turned off battery saver, but it happens it turns off and I cannot turn it on again. The only way is for it to go sleep and click some keys on the keyboard to turn it "on" again.
How can it never turn off (only when the battery is at 0%)?