Ending the SearchApp task has quietened everything down for now - fingers crossed but I'm not feeling too optimistic!
I've checked my updates too, only one thing updated today (related to Defender Antivirus) and the same cumulative update as you JimmahChongah ( KB5010342) yesterday. Which includes something about the News and Interests feed - is that what Feeds is, which includes the problematic SearchApp? I have no idea with this stuff.
I am in the same situation as you and I also closed the process in the task manager... has it happened again to anyone?
My concern is that it is a virus but being from Microsoft nothing will tell