I have had the system running the way its wired and working fine well before starting service with surety ( so well over a year or two)
The panel from the alarm box is about a , 30 foot distance. Never had a issue before.
It is possible. A few days ago I unplugged a deal in the attic above/ near that panel.
I plugged it back in. But that was a few days back. I was looking for a power plug for a secondary panel I had. ( found it with my tracer) but it ended up being a gc2 secondary and not compatible with my gc3…
I will go up in the attic and look to see if it possibly fell out of the plug.
The only power wires I see in the box come from the battery and looks like a pair of wires going into the wall. I can trace them , if needed.
Just odd, out of the blue. When nothing happened. I have tesla powerwalls , so I am never without power . And use surge protectors .
I will go check that plug up in the attic, than properly power cycle the gc3 panel and see what happens.