After almost three years, my Philips Sonicare DiamondClean Smart Electric Toothbrush (HX9924/46) decided to give up of me. There is some issue with the power connection because I could not charge it or power it on.
I am sure the battery is charged as I left it on overnight, and there is an indicator that it was charging. However, when I took it out the next morning, I could not power it on.