No, it's probably a process that has a higher priority interrupting the video.
That won't happen. GPU drivers are run in the kernel so nothing can interrupt them.
I had nothing else running, although I just managed to fix the problem.
I had GPU accelerated processing on, which took 100% GPU usage and crashed it(I think)
It's all good now.
GPU accelerated processing is nice but it's still a little buggy. Try updating your video drivers to see if they fixed whatever was causing the driver to crash.