It's *not* the supply.

The supply is 12v, all the circuitry apart from the DAC 5v analogue supply is run from a 3.3v switcher - the voltage would have to drop out all the way so that the 3.3v switcher stopped - and at this point the reset monitor chip (which looks for a stable >2.93v supply) would reset the unit totally, hence you'd have press power to get it on, do a full reboot, etc.

Just stopping playing is a software/network issue. The first couple of seconds would be the first http request getting serviced (32k) - if it doesn't get the second and subsequent ones it'll stop.

Hugo