Windows machines rarely last more than 14-18 months with me before I reload them. I’ve got the backup/replace/restore process down to a fine science.
Those who suggest that you dig into the processes and/or event viewer are absolutely correct - but I bet you could poke around in there for hours and not find anything readily apparent.
You may want to think (and plan for) a refresh.
That’s what I always did when I had Windows based machines. It’s really quite easy to do a full restore once you get the process down and after the first one (for myself at least) there was a noticeable improvement in performance. Probably from the removal of all the preloaded software junk that comes on all Windows computers you buy at places like Best Buy.
Once you get the operating system loaded the way it was intended, it works a lot better. I got another 3 years out of my Windows machine this way.
It just takes a lot of time and of course you need any software you want backed up as well as the files/documents. It takes like a Sunday afternoon of loading all the stuff you had before back on, and then reupdating everything.
It’s easier for me though to just use Macs, they are more expensive but they don’t need to be “refreshed” like that every 6-12 months. They just work. And now most software (except for some niche software) is written for Macs too. So that last hurdle between Windows and Macs is gone. I’ve never had to sacrifice acquiring some program because it’s not written for a Mac since like 2004.
(Oops now I’ve gone and done it; started a Mac/PC flame war!)