My Allo Boss card has stopped working on my RP 3. I tried reloading the software and then tried a different software Volumio but still nothing. Plugged the Boss card in and measured the current and it is only drawing .03amps which doesn’t seem like much. Tried a different power supply but still nothing. I am using the Allo Shanti power supply and when I first got it kept the lights on on the pie for quite a while after the power was switched off but now it only powers it for about 10 secs after the power is pulled although both supplies are running at over 5 volts.
That sounds a lot like defective hardware. If possible, send us the sound card and the power supply back so that we can test them. We will replace the defective parts if necessary.