Buy an NVMe or two, and don’t use your OS drive with MM.
Agreed - your ssd is maxed out, your cpu is not busy…as in not busy waiting for it to catch up. Get one or two better ssds dedicated to plotting only.
it might be overlocked preset, boost or something in software you use, get it off.
they all buggy lately especialy on new motherboards.
and of course sata ssd isn’t way to go