IT seems every now and then with certain alerts my apple watch vibration motor feels like its stuck in mud, that it's struggling to turn. just like when you hook up a motor to a 9V battery that is almost dead and it can barley spinning it, only thing is my what has over 90% battery remaining. This has been going on for a couple of days and its not all the time. I cant reproduce it on the fly. I know that apple watch having manufacturing problems with the haptic and taptic feed back system, could mine be part of that? any one else notice this?