I'd make sure you aren't running out of RAM. You've only got 8 gb, advertising to your post, and it's entirely possible that you have enough stuff running in the background that your computer is trying to dump some of it into the swap file and picking the wrong stuff... Like operating system files, right before they need to be accessed. Shouldn't happen, but we've all seen weirder stuff happen.
Best way to do it would be to disable the swap file, then make sure you've got task manager open and try to duplicate the problem. If it gets over 90%, disable some startup programs and see if that helps.
Assuming you have windows 10, you disable the swap file by going to control panel/system and security/system, then clicking on advanced system settings on the left. Then hit enter (the correct option is pre-selected), click advanced when the new screen pops up, and click "change" on virtual memory.
Then uncheck "automatically manage paging file size for all drives" at the top, and select "no paging file". Click set, click okay, restart your computer.