Has anybody experienced this?

I cast from Chrome browser on my laptop. I normally do mirror tab. For some reason it plays lag free when initially mirrored, but as soon as I enable fullscreen on the laptop it starts losing sync between the picture and sound on the TV (now in fullscreen).

As I said, if it's not in fullscreen mode, I don't seem to have any problems seemingly. There is still a delay on the screen with the mouse cursor, but the video itself seems to play fine. As soon as fullscreen is on though, it starts up.

Any ideas? I checked on a first gen Chromecast with the same setup and this problem doesn't happen. It's only on the Mi Box.