Bests & Worsts Reviews from Amazon

I got this as a gift for my daughter last year. Recently, she smelled an electrical smell coming from her bedroom and discovered that the dimmer switch on this lamp had melted. She is just lucky it did not start a fire. We saw a post on fb the other day that indicated that another company of salt lamps was having this problem. I also have one from this company too and am now afraid to leave it unattended. What is up with these dimmer switches?