I think I may have fixed my linux laptop crashing
Disable the graphics card!
Background
Crashing on average once a day is not cool for a linux laptop. It has taken me a long time to figure out what the problem is, because the logs that I can find on my computer have not been that helpful. However there are few things that should be able to crash you Linux computer. But one of them apparantly is the graphics driver. Well, it does not actually crash your computer, but it makes it inaccesible. I noticed things kept on running and playing. For a while the computer seemed more happy with the open source dirver, but alas, that joy did not last. So I decided to try the old use-different-drivers-and-see-what-works again. But then a small detail caught my eye: The Nvidia X server settings applet has the option to completely shut off the graphics card!
So now I am running on the Intel built-in graphics thingamajig. I don't mind; I'm, not a gamer. Hope this stability lasts.
And picked up this protip from the Internet. If your screen freezes, but you can still move the pointer, the problem is the graphics card system.