@leocg The other problem is a bigger one that I have had the last few years; I just stumbled across this one checking date stamps of files when it occurred.
My system will go into 100% high CPU utilization for a minute or so, grinding my HD and making the CPU useless. Taskbar comes back and the processes are clean.
I have found similarities with this and the High CPU problem Google has with their Snyc program (complaints).
After the last episode, Google date stamps were changed in the Sync /Storage directories, so trying to isolate it with his random problem. It doesn't react the same to CCleaner as the other directories.
Have a place to look now.