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This year it has happened to multiple students. At least 4 and they have lost work and had to start all over from where they had last saved. It seems to happen when they have a lot of costumes or clones.
I will find out. It is working fine now it just crashes when she adds more code, but another problem is with the students who are using clones it starts to get extremely laggy the longer their program is running and it happens pretty quickly. For example on the above project, all the cars start to slow down. I did mention to them to try Firefox. I see them later today and I will get back to you on which version of chrome.
I see. You may want to read these if you have not already:
Could you share the links to the other projects, please? Also, just like bromagosa said, version hugely matters. There are many other topics in the Forums like this, which seem to be happening due to the version.
This one also got laggy, when I completed the task or mission. But there is a bug(if this project is finished) in the project, which may make it look glitchy.
You could also try Microsoft Edge. Some other coding platforms, like Scratch(not coding language though) have stopped working on Chrome; but still work nicely on Edge. Nevertheless, Firefox should be better.