Display and screen... haunted?

Hi. My FP2 screen is frequently self-activating maniacally!
After waking it before unlocking, it shows numbers 1 and 4 pressing on the keypad and entering continually to the unlock screen until I take the battery out. When I do get it unlocked, it opens apps, rapidly pulls up and down the wifi/notifications box and switches the mobile data on and off, the light on and off, and the keypad is unresponsive. Sometimes after having the battery out for ten minutes it returns to normal for an hour or so before repeating the process.
This started about 2 weeks ago, and is becoming more frequent. I have carried out the FP update a month ago, and have not downloaded any apps this year. Help!

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