I and others have noticed this happening time to time lately.
It's not just Zorin...
Just in general, I keep noticing bogging and delays on Linux servers over-all.
I have no idea the cause; searching the issue yields nothing of course.
It may be due to more and more people just switching to Linux on the whole, after Microsoft changed over to strict requirements converting new computers to junk with Windows 11.
Often, trying again after a short wait seems to clear it up.