Had the same issue, would turn on and off on its own and I couldn't turn it off. I used this video on youtube to open the unit and found some wet toothpaste inside. Wiped it out best i could, cleaned the inside plastic, and dried it with a hair dryer on low setting. Reassembled and it worked!
ONE SCREWDRIVER to open your sonicare toothbrush without destroying the...
Mine won't either
What did you do about it? Wait for battery to die? Did you contact sonicare and were they helpful?
Eventually it ran out enough to stop, we then gave it a full charge (whichbit wouldn't takecwhile it was on). It has been ok since. We contacted philips and they said it would be under warranty and that we should contact our seller. It's working now though so we didn't bother.
I'm having the exact same issue. Was brushing my daughters teeth and it won't shut off.
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The best electric toothbrushes are the Oral-b Professional Care and the
Phillip Sonicare Diamond Clean. You can find more information on these electric
toothbrushes on their respected websites: http://www.usa.philips.com/c/diamondclean/289711/cat/en/ and http://www.oralb.com/products/professional-care-smart-series-4000/.
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