good cleaning results, poor life

although each family member has its own Sonicare, therefore each is also not used excessively, things go abound broken. Because it does not matter whether cheap or premium product model. Be it the silicone gasket from the transition brush for housing that is leaky, allowing water to penetrate (3x) and the electronics goes crazy, it was that the connection drive breaks the brush attachment (engine works, brush attachment does not oscillate (3x), now currently listening one at the Sonicare (2.5 years old), a low hum, brush does not oscillate. Now Repeats the built limited service life, as we know it from the bulbs, especially now that the bulbs business goes back?
As a dentist, I am convinced of the cleaning result, so I find it hard to switch to a different product, annoying I find it!