I got my 1st imini in jan 2019 at greenpharms in mesa about 3 weeks later and not everyday use it stopped heating up but the light still works, my thought was i must have done something wrong. In Feb 2019 I go back and get another one it is now March 2019 and the 2nd is not heating anymore same as the 1st I only used the charging cord that came with it and I made sure not to over or under charge it.