Whew, out of thin air, my #computer started playing up today. In #KDE I kept getting crashes and restarts of #kactivitymanagerd and a high load (around 8) with constant disk activity and #abrt popping up very irritating messages which I couldn’t even report. It was very annoying and seriously disruptive.
A search online suggested is to remove ~/.local/share/kactivitymanager/resources (I haven’t deleted it yet but renamed it). That seems to have fixed it.