Disk usage could be the problem
elaborate?
A lot of HDDs suffer because of how slow they are, if you have programs in the background constantly reading/writing it makes it harder for new programs to read/write to the disk, check task manager too
That might be a major program but there are services that also run in the background too
You can most likely disable a few of them but I don't know what is running so I cannot answer that
Did you ever leave a server in the middle of downloading a file? I think sometimes they can corrupt and mess with the cache.