Millions upon millions have been sold, with complex parts sourced from all over. These things store a lot of energy, and with so many in existence, once in a while, its possible one will explode, or grow legs, or rise into the sky, or begin reciting Hamlet. Its just a matter of probability. I see no reason to doubt that this might happen, 1 time in 10 million, through no fault of the user. And if it does, that user certainly ought to get a replacement!