Waste of Space:
Your computer may have updated to Windows Version 2004. If so, Malwarebytes Premium is the source of your issues. It is not fully compatible and causes all kinds of issue on certain computers. Please see this post, and more, in this Malwarebytes Forum.
In addition to what is suggested in that specific post, I would recommend shutting off "Fast Startup", enabled by default. Also switch to accepting Beta versions, under Settings, General, and download the latest Beta Version. Disable the Ransomware Protection module. I have had to do this with both of my computers, running Version 2004, to have reasonably acceptable performance.
Malwarebytes is ACTIVELY investigating this issue, and has been for over a month. A fix is expected soon, possibly even this week. You will find lots of posts, including one by yours truly, about the problems caused by updating to Version 2004 of Windows if you have Malwarebytes Premium. I don't use Windows Defender (I am a Bitdefender 2020 Total Security user), so I doubt that it is a Windows Defender update causing your issues. I had to tweak Malwarebytes Premium to delay start-up to permit my Bitdefender to successfully load first. A lot of people have spent a lot of time trying to figure out what has gone wrong with their computers, as a result of this incompatibility.
I hope this helps. Have a great day.
PS: phillpower2: My apologies for "hijacking" your thread.