Thank you so much for the simple solution. The sudden CPU hogging and write was driving me nuts. I even did clean reinstalls a couple of times but didn’t have much time to check up on it till today with work and all.
Update: it happered again and again. Every time I save desktop settings my CPU usage spikes.
I then Run " cd ~ && find .config -name mimeapps.list -exec mv {} {}.back \;" and it calms down.
I hope a permanent fix is on the way.
Cheers