Mine popped off but still got it to work [SEP] Maybe I’m the only one who this happened to, but the first use my larger piece popped off with very little force. I was able to get it back on and squeeze the sides to help it stay in. I do actually like this product and it stays cold for a while after taking it out of the freezer. Ever since putting it back in it hasn’t come off. I also like the way it feels for facial massage and lymphatic drainage.