So we have 3 of these in the family. I'm on my 3rd in just over a year - multiple issues with 1 & 2, one of my daughters is on her second and has given up as #2 randomly vibrates on its own, daughter number 2 has yet to experience issues but uses sparingly as rarely at home - maybe she'll be lucky??
Without the repetitive problems these are good toothbrushes and clean well but are VERY expensive in view of all the issues we've experienced... Customer service is good but reliability and therefore sustainability are pretty poor tbh. I'm afraid we're going to give up now.