ZBrushCentral

Mouse cursor disappears quite often, needs restart

Hello everybody,
after approximately each 30 Minutes of work I get loosing my mouse cursor. Especially outside the canvas I can only find the right buttons by guessing.
Then only a restart of zBrush helps, which is quite annoying. Has anybody an idea?

zBrush 4r7 p3
windows 10
gtx 1080 Graphics card
SSD
64 GB Ram, new PC from professional CGworkstation store (so I can be sure, it has only to do with the software.

Initialize doesn’t solve.
Thanks for comments!

Ok, not sure why it’s working now, but I think the reason was something went anyhow wrong with hotkeys: The “M” hotkey made the mouse cursor disappear today. Reasigning this hotkey (to IMM brushes preview) solved this all so far.