Was the inside of the car exposed to excess moisture or extreme temperatures? Was it connected to a power source that is active when the car is off (did your car start after you took it out of storage)?
Solid state electronics are pretty robust. Certain levels of humidity and temp changes could cause issues if there is power to the board in any way, or power to the board shortly after exposure to excess moisture without proper drying, but an unpowered board just sitting in a relatively controlled environment shouldn't just break. I mean, everything in the car would be at risk if that were the case.
Something may have failed in the unit when you started the car for the first time after it sat. Maybe it couldn't handle the voltage surge from a system with a weaker than normal battery? Bottom line, is that a product like that should be able to handle these kind of automotive situations. Your unit didn't. Your best bet is to probably buy a new one from Amazon and return the defective one in its place.
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