I have had problems with my system for a few weeks now and have been unable to find a solution or cause.
It was first noticed when I tried to shut down windows 10, I would click start and move the pointer towards the shut down button, Cortana opened itself and the number 4 was repeatedly appearing in the text field. I have now killed cortana.
In Facebook typing in a text field the caret sometimes moves backwards as I type.
In Adobe bridge in an image preview page selected thumbnails are changing themselves, the selection moving backwards.
I have run a full antivirus scan and the system is clean.
Needless to say this is somewhat annoying and any help would really be appreciated.