K32 only the pixels stopped outputting

[tetleytealeaf]

Reporting a strange problem:

So I'm still running my show.  Valentine's Day.  I haven't even touched anything, besides just reprogramming the Scheduler to play VDay sequence back around week 2 of January.   Two nights ago--all by itself--my master K32 controller decided not to output any pixels at all, including on the receivers.   My remotes worked ok (including a remote K32), the ttys 1/2 ports on the master worked ok, the audio output from the master was ok.  Only all the pixels didn't work.  

Then...last night...the problem fixed itself.  Just as easily as it stopped working, it equally decided to start working again.  Huh??   What on earth could be the single point of failure that would cause only all the pixels on only the FPP master to not work for one night?   Being hacked??   I can safely rule out the PSU (since the receivers are on their own PSU's and also did not work).

[AAH]

A pebcak issue is what I would suggest is the cause.
Without screenshots of the settings there isn't really anything to go by. If you have logging enabled you might be able to see something in the logs to indicate what was going on at the time the schedule was ticking over.