Clarisonic users. anyone had problems with theirs?

[jammietart]

I've only had it a few months and I can't seem to change the speed using the change speed button. anyone else had problems? it doesn't seem to have any trouble shooting tips in the instructions

I only have the single speed Mia. I can't use it in my face though as it's too much (even as a regular user of BHA & AHA toners). I use mine as a body brush now.