Fairphone 2 unusable while charging

[paulakreuzer]

I still don’t get what you mean by “unusable”? Does the touchscreen not respond at all or does it misinterpret the touch inputs.
In the latter case it’s a known bug:

Fairphone 2: Crazy touch inputs (touchscreen issue) - workaround (for some): increase touch & hold delay

Troubleshooting Tips: Increase the touch and hold delay: Rule out screen & battery issues #disassemble your phone, carefully clean the connectors perform a battery reset as described in the #batteryguide Update your Operating System (You can manually update as described here even if your screen doesn’t permit you to update normally). Try to find a pattern. When does this happen? If it only happens during phone calls than it’s probably a proximity sensor issue. Go here for more info an…