The same problem is happening to me now. I haven't done any changes for hardware and software on my laptop to create this. It just happened while I was working on a file. I've done a reboot, safe reboot and they don't help at all.
What is really happening is Excel is crawling. It may be slow enough depending on your system that you either get a no response dialog from the OS or it crashes. On mine, it takes forever for it to execute a function. This could be as simple as selecting a
cell. Memory usage reports normal, CPU usage reports normal.
Starting Excel clean, changing your printer if you can (mine is default to PDF creator), and then open your file. This seems to be the only solution to me, which is rather very annoying and cumbersome. PDF creator has not been updated and was just working prior
to this crashing.
I hope MS has a solution as it appears they have given up on this thread entirely. I have little hope on this community and I advise others to not depend on it as well. I have several critical and severe issues that they have not even address and/or follow
up on. I'm talking about severe and critical so I'm not sure why they don't think it's important enough. Good luck everyone, going open source soon in my case.
Edit: Did a few more testing and the it still crashing although not as often. This is with switching printers around prior to opening the file to work on. When Excel starts behaving in this manner it does actually chew up 80% of the CPU time. This probably
explains why it is crawling at a snails pace. Utilization won't return until it has recover and in one of my test it did actually recover by itself without having to close or do anything. Still not sure why it just now starting acting up.