Case fans keep going bad...

So I run a OSRS gold farm on my botting PC basically 24/7.

Over the past two years, I've had to replace 3 different case fans.

My CPU generally sits at about 65%-70%, 24/7. I had to replace the first 3 fans within 6 months of owning my computer, now about a year later another case fan is starting to go (one of the fans I replaced, I still consider the fan to be "new")

So my main question is: Is this a common thing with this sort of computer use? If not, do you think there is some underlying issue?

I don't really mind replacing fans as they're fairly cheap, I'm more worried about there being a more "expensive" problem.

Any replies/input appreciated, Thanks!

Edit: Sorry, I think I posted this in the wrong section, I'll re-post in community general. (I forgot Mods have to approve posts in this section.)

 

Tech section seems appropriate enough.
I don’t think that’s right. I don’t run my casefans at anything higher than 40%, so mine don’t break easily. You might want to invest in a case fan controller panel to hook up your casefans with some control over fan speed and the voltage that’s running through them.