To have the watch band break just after the warranty is over is good for Fitbit as it shows that their program is set correctly for the quality of the products they make. Does that make the watch user happy, No! This type of failure occurrence should drive Fitbit to examine the quality of their Charge 3 band manufacturing.
My Fitbit band, black L/G, failure mode is it just broke 1 inch from the buckle end and with another crack in the band which would break after further use. Unfortunately for Fitbit Quality Department the band on my Fitbit Charge 3 has no date code or other manufacturing codes that would help to isolate the time and batch of plastic resin that was used and to verify if the manufacturing parameters were at acceptable when this watch band was injection molded. The second failure mode fracture in the black L/G band is at the end of the slot to the edge of the band and this fracture is also at the other edge of this slot. Both fractures are over 1/2 the thickness of the band. These failure modes would point to and abnormal process variation or problem with the resin pellets used to injection this black watch band. This watch was used in normal human wear in normal temperature environment.
Prediction is that Fitbit customers that have the Black L/G watch band for Charge 3 will experience an abnormal amount of breakage of their watch band.
The big question is what will Fitbit do to prevent further watch band failures. Engineers at the manufacturer need to implement at CAPA, Corrective Action Preventative Action and to find the true Root Cause of fractures in their black watch band failure mode.
My prediction is that customers with Charge 3 black L/G band will experience an abnormal amount of band failures.
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