You have at least 5 ghost / dead nodes where no device is attached to them. You should try to remove those if you want, instructions are here: How To Remove Ghosts using hub tools or a UZB Stick . Try the on hub method first, I think you can clear some of them that way.
WHat is the footprint of this home (sq ft of main floor)? Seems like the devices may be spread very thin.
Did you try power cycling the wall switch itself with the circuit breaker?
