I went from a solid white circle to a blinking yellow circle.
It occurred after circuit breaker tripped.
I tried resetting the ONT as well as repairing with the router and resetting the extender. Even with the blinking yellow light I still have connection with my physical ethernet cable to my pC however my speeds are significantly reduced now.
I have gigabit ethernet and I was getting close to 800 now it is close to 250-300
It is hardwired connected via MOCA connection - TV/FIOS tv works fine and I am using verizon branded splitters.