My girlfriend has a Nexus 4 and when using both Skype and Google Hangouts recently the video image starts scrolling up the screen and looping round.

I have uploaded a video of it doing so . It doesn't do it all the time and by hang up the call the problem is solved. It is definitely related to the nexus 4 as I have viewed it on my 920 and laptop.

Not sure what would cause this, my guess is just a software thing but wondered if anybody else had experienced it?