Fuze V1: car adapter mode not working

[skinjob]

Is car adapter mode expected to work in RB 3.7.1 on a Fuze V1?  I was trying it today and it seemed to work the very first try, but has not worked since.  On the first try playback continued while connected to the USB car charger and paused when the car was turned off, as expected.  However, after that first apparently successful try, anytime I connect to the car charger the player stops playback and goes into USB connection mode (where you get the USB plug graphic on screen and all the controls are disabled - like when connected to a PC).

Is anyone else successfully using car adapter mode with a Fuze V1 or is this feature not quite stable yet?