We've just hit this issue on some of our alma 9.3 hosts The triage was to look at the number of file descriptors that automount had open.

ls -1 /proc/$(pgrep automount)/fd | wc -l

Most clients are well below 100, but a few are in the thousands, and when they hit the default soft limit of 20480 (cat /proc/($pgrep automount)/limits) autofs breaks - starting with too many open files.

systemctl restart autofs resolves it, and seems to 'clear' the problem on any clients straying up past 1000, but it seems there's got to be some sort of file descriptor 'leaking' occurring here.
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