Uncontrollable automatic input in FP2

I work with the latest version of FairphoneOpen (thanks God, the version of April 1st become a new one), but a few hours age, when I activated the scrren the phone hat automatic input, very fast and did not stop.
So I shut it down and restarted it. When activating the SIM card there came automatic input, too and just in time I stoppen the Phone by removing the battery so that I could avoid the third false input.
In this state I cannot operate the phone.
Does anyone knows a reason on, more important, whot to do to come to a working phone?

A post was merged into an existing topic: Fairphone 2: Crazy touch inputs (touchscreen issue) - workaround (for some): increase touch & hold delay