Just a guess... but I think an ad of some sort is running a type of mining software in the background.
Sometimes when I'm using the site, my laptop fan will fire up and my laptop gets very hot. I just copy the address of the page I'm on and close the window... then reopen the browser with that address and it's fine.
The fan shuts down, computer goes back to a normal temperature and all is good until I get hit with the mysterious process burning up my computer again.
I think it's an ad - not this site directly.