When switching to full screen or vice versa, the video is reloaded
Can not reproduce this on 1.10.867.42 Win 10x64.
I can reproduce but only when in fullscreen a video ended, I click another video (or the next video in the playlist autostarts) while I'm still in full screen, exiting full screen makes the YT player reload from the point I was. At that point I can switch full screen on / off as many times I want. In other words, happens but only once per video.