I believe you.
I'm just saying, that i wouldn't consider 200 hrs/month heavy use and it should take that load easily. I'm pretty sure, that quite a few of us run our machines ~24/7 with no issues for years.
I still have my Pentium 4 desktop from 2001, which i obviously don't use anymore. It's kinda weak for nowadays standards, but it's still working and until we (me & my family) used it, maybe for 10 years, it was on pretty much 24/7.
I'm using a mediocre Lenovo notebook now, it's close to 3 years old and it's also on 24/7 for the most part, running multiple instances of different social media bots, so resource usage is quite intense.
At the same time, i bought a notebook for my mother. She used it for maybe 2 years, normal use, so nothing anywhere near running it 24/7 or doing heavy tasks and one sunny day, it went poof. It had a pretty good AMD graphic card, she wasn't a player, so the machine haven't really used it much, because it had an integrated graphic card too, but the AMD graphic card still was faulty, which led to a motherboard failure.
I guess sometimes we're just unlucky with a particular machine/config, be it a factory fault or something else. It's not always the usage or just the usage, parts can be faulty from the start.
For how long did you have that machine?