Last night, I turned off the phone, and plugged it in, as usual. It’s the same charger and cable I always use. I didn’t look to see what happened, since it’s just habit - I just plugged it in and walked away. This morning, the phone was hot. I turned it on, and battery charge was at 39%. I plugged it in while turned on, and it kept vibrating one vibration and showing “charging” popup banner, over and over. It did it 5 times, and then settled on “charging”, and stayed that way. However, the battery did not charge, but the percentage droppe, even while showing charging. Then I turned it off, and reconnected it, and watched, and the led would go back and forth between red and green continually, the screen never turning on to the Sony screen, and showing battery charge, as is typical. I guess this is what must have been going on overnight.
Now, this is where it stands - plugging in while powered on results in exactly 5 vibrations every time, then settling on “charging”, but without actually charging the phone, and plugging in while powered off results as described above. It doesn’t matter what USB mode I choose, and I’ve tried with different chargers, cables and outlets. Everything was normal until last noght.
Phone is Xperia X, with latest SFOS, (3.3.16 or whatever)