It IS serviceable. Had the same problem with mine. When I called them, no help as was out of warranted. Asked if I could take it apart, the reply was " it's yours, do what you want with it!". So I took the back off, yes you can with some work. Found 3 of the bolts had come loose holding the relay and were ratteling around in side. Took some locktite and reattached the bolts. Lots of silicon when putting case back together. Still works great. They really need to use locktite in production, this seems to be a common problem.