v5.1.5373 active monitoring not activating properly

Ccleaner active monitoring keeps deactivating on my system.

I have the option for active monitoring ticked. My setup runs Ccleaner at startup.

Ccleaner runs as it is supposed to, but active monitoring closes a few seconds after Ccleaner finishes.

I have to start Ccleaner manually in order to (re)acivate the active monitoring. Even so, it sometimes shuts off again later.

I really want the active monitoring to work again, like it used to!

OS Windows 8.1.