This has happened twice now. I don't know if it has any connection with my other ongoing problem detailed here, but when I play a streaming video and then plug a HDMI cable from my TV to my laptop, the laptop sometimes (not always) immediately crashes, and then goes through that whole updating/failing-to-update/restarting cycle described in my earlier post.
My wife's theory is that connecting the two devices after starting the streaming video on the laptop is the problem, and that I should first plug the cable into the new devices, and only thereafter start the video.
That doesn't make a lot of sense to me, but I am no expert on the subject - anybody?