Everytime I charge my Sense it goes into an infinite loop, "it displays the charge level, then the home screen and then the message that it can charge faster if plugged into a faster charger with a big Orange OK and finally screen goes dark" it repeats this every 30 seconds. Oh did I mention that it vibrates too every 30 seconds. Reviewing the PDF manual there is no mention what charging speed or type is needed. I have so many different chargers, like the Samsung adaptive charger that can charge at either 5 volts or 9 volts. For such an expensive Fitbit you think you would provide the best charger for the Sense. This is a new event. This charging experience didn't happen a month ago. Now I have to charge the Sense in a room that I'm not in so that repeating loops don't piss me off so much.
Fitbit Product Experts Alumni are retired members of the Fitbit Product Expert Program. Learn more
It would seem the watch is either dirty or the charger is not making good contact, a common problem.
Best to try connecting to a PC and see what sounds the PC makes. A single recognition of a device is good, repetitive connections is a faulty connection with the watch.
As your watch is under warranty probably best to contact Fitbit Support directly. They may be able to help you with a replacement charger if necessary.
Author | ch, passion for improvement.