Could be a little dusty. You have to remember to clean those well. Dust buildup can cause issues. The other thing ive seen is they do wear out. I've had a few for a while but I take them out every so often and look at the base. If it looks like its corroding it gets replaced. The only other thing I can think of is they do get incredibly hot. If its not a dome that has the ceramic they can melt the plastic of the other ones.


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