Hi there!
I experiance excatly the same problems as described by @arise-teamrider.
I then tried the workaround described in the Crazy touch inputs (touchscreen issue). This, however, made the behaviour even worse in my case. The unlocking screen showed really weird phenomenas, like a kind of flickering of large squares.
Also, when i further increase the “touch & hold delay” to long, the problem still persists.
The charger I use is from “Emerson Network Power” and I used it together with my HTC, on which it didn’t cause any problems while charging.
When I use another charger, namely a “Samsung Travel Adapter” (Model: ETA3U30EBE), though, with an output of 4.75V and 0.55A (which is actually not the recommended output of 5V and 1A, like described in the manual), then the problems also persist. But, the problems occur far less often (e.g. when unlocking the screen, about 3 out of 5 times it works, whereas with the HTC charger about 1 out of 6 times i unlocked successfully).
I guess, it would be useful to publish a growing list with FP2 compatible adapters?
It’s great to find help here already, thanks for that!