You could try setting your iMac to reboot once a week - perhaps 7am Monday morning. That may deal with your problem - this is a ‘try it’ solution rather than a ‘this will work’ solution. Good luck.
Jan, if that’s aimed at me, there are far too many possibilities, particularly when I don’t have your computer in front of me. Computers crash, old ones more than new ones. So I’m suggesting a work around.
For context, going back a little in time, it took Microsoft 3 years to realise they had a bug in Windows 95 that would only let it 30 days without crashing. Mac OS9 used to crash 3 times a day on me. Things are better these days, but not perfect
Ben with the support team here, thanks for your patience while we work through each thread.
I wanted to follow up this thread to see if you by chance had the date and time the last time you experienced a crash? If not, please jot down this information the next time you experience it, and share it here.