Video Quirks in Windows 8/RT

I currently run the consumer preview on my laptop (waiting for my new SSD to arrive to install W8Pro) and have been noticing some strange video playback behavior. I thought it was because it wasn't the final version, but I've noticed it on my Surface RT as well.

Every time I'm watching a Flash video, it prematurely ends, with maybe up to a minute to go. Has anyone been experiencing this? Does anyone know how to fix this?