Bests & Worsts Reviews from Amazon

I really really love this toothbrush, I bought one each for myself and my husband. I've had it for over a month, and this morning I saw the upper part BURNED!!! I wasn't charging it, it was just on the table. I'm so afraid now what if it caused a fire while we were asleep. I'm grateful for Amazon for having me return it with full refund despite it's been out of the returning window. But for Sonicare, please investigate this. This is not safe!!!