The loose ground may have been the LED problem all along. Loose ground can cause a surge. I live on a boat and 80% of electrical problems I've had all lead back to corroded grounds. The local hardware guy has a spray on product called "Corrosion X" It is amazing. Stops the corrosion, cleans up old corrosion, leaves a lasting film the inhibits future problems. Only problem is his little hardware store is the only place I've ever seen it. Works great on battery terminals too. I'll ask him if he has a brochure that maybe has a URL in it.

BTW, Etl engineers also believe when it does break it's a maintenance issue, lol