Bug report: Forerunner won't charge on version 20.26 (and also on the last beta of 20.xx)

Quite often when I connect my forerunner 965 with a cable to a usb adapter to charge nothing happens

After a reboot, charging does work. As long as it lasts. Unit I have to reboot again. 

(no, it's not the cable or the adaptor. Tried several)

Are you aware of this bug? If not, please report it to the developers.