My partner and I have both had these fail on us now, luckily the most recent one to fail might still be under warranty.
Gluing the last one had limited results, only lasted a couple of days before falling apart again.
In my opinion it's a pretty poor design, looking at the tiny little plastic poles that have to cope with the strain of the watch band.[br]
Interesting to hear that the Charge 5 has the same issue, I think we'll be changing to non-Fitbit branded fitness trackers sooner or later.