Hello,
my battery relay disconnected the battery for a split second while I was feeding to the grid. Bad connection.
After that event, the Multi's GX no longer responded. I power-cycled the whole system, but now the GX display says "system halted".
Owch.
What do I do now? "Ignore the built-in GX and use a Raspberry Pi 3 with Venus instead" is an option I'd rather not pursue, if at all possible. :-/