I bought a toothbrush like this, charged it fo 16 hours, and when I start to use it , it was working for less then one minute and after this is not rotating more, even when it is installed on the charger. For two days it is now mounted on the charger and it is not rotating, only I am feeling that is trying to activate the motor. Do you have any suggestion what to do? By my opinion the charger is not working?... Thank you in advance for your help, Rela