I’ll have to say I haven’t seen update cause the kind of problem you describe, esp. since you have update turned off.
Since this happens after the computer has been on for a couple of hours, I’d look and make sure all of the fans are running properly, including the power supply fan. At the same time, make sure your computer isn’t clogged up with dust and hair and such, esp. the CPU heat exchanger. (I’m assuming from your description this is not a laptop, and though dust and over-heating is even more prevalent with laptops, the dust is harder to get out.)
Also, both semi-legitimate and malware programs running the CPU constantly at 100% can exacerbate overheating as well.
Thanks.
Dust COULD be a factor, since The Homestead is still nominally a working ranch (got a real nice view of the North Rim of Yellowstone over the monitor), but Grandma is so anal about cleaning the housecat and small dogs all go into hiding as soon as she walks toward the closet where the cleaning gear is stored. (The little terrier tries to attack the vacuum and any broom/mop/duster hits the floor, but they’re all bigger than she is, so....)
Still, it’s been a while since I checked the desktop fans/filters, so thanks again for the reminder.
...but me run the CPU at 100%????
Ain’t happening. Gotta be dust or maybe even stray bits of the tinfoil hats that have gone into style lately.
Oh, yeah. ?sarc