Seems like it's possessed by a demon, what part's gone wrong?

While using the phone, on a call the other day, it went absolutely crazy and phantom touches happened all over the place. Hung up the call, opened and closed tabs, changed the date and time, then eventually went into airplane mode.

Video of it's behaviour is below,

https://www.youtube.com/watch?v=4hFJ80sL...

I'm able to plug in and view the logcat of the phone, and I really don't think it's a virus, or anything like that looking at what's going on (I'm a mobile developer by profession), so if it's not that, any idea what could be happening?