Over an extended period of time (I've started running a Maestro in the office during the work day) I will occasionally lose the waterfall.
Typically after 4 to 6 hours running. Area is black & blank where it would have been.
Of course today when I wanted to get a picture it is running just fine after five hours up.
This may well be specific to a network issue on my system and have asked son Winston KC9FVR to review logs off the network devices for correlations.
Will take a photo next instance, and of course regardless of the drop of the graphics on a Maestro reboot all is well.