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Original post by: randy ,

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I have noticed the loud buzzing '''ONLY''' when I am using the '''Sonicare Diamond Head''' Toothbrushes (purchased at Costco) with my Flexcare+ - When I use the regular Sonicare Toothbrushes the loud buzzing stops.  I have purchased the Diamond Head Toothbrushes at Costco 3x now and they all do the same thing - loud buzzing.   This happens on my 5 year old Flexcare+ and my newer one I just purchased.

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