When watching a video in full-screen out of Safari, the video controls keep popping in the screen (just as when I touch the screen, but without me touching it). This keeps happening at seemingly random intervals, and the controls pop out again after a few seconds. The video I watch is from www.zdf.de/zdfmediathek. I have not been able to notice this issue on other video sites, but I had the same issue when watching a video from this site on iCabMobile browser.
I have an iPad 1, OS 5.1.1 (as OS 6 is not supported on iPad 1).
Any tips are highly appreciated, this issue is pretty annoying.