This started after I tried to completely discharge and then fully charge the battery, as it's recommended for li-ion batteries once a month or so.
I'm not sure what the problem may be. J could've damaged the battery, or it may be the charger.
Also, there is this curious condition: when charging, the touchscreen loses sensitivity. It handles like a very old resistive touchscreen. Only when charging. I have no idea what the cause may be here either.
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