I've been using two of these amps for about a week now; both were working perfectly until yesterday. One of the amps is only putting out audio intermittently now. It's mostly silent now with audio sputtering in and out every now and then. I've swapped all combinations of amps/raspberry pi's/power supplies/sd cards and it looks like it's a problem with one of the raspberry pi's, not the amp.
Any idea's of what the problem could be? There aren't any errors on the pi; I've double checked the connections on the P5 header and all seems fine. The pi was new and hadn't been used for anything else. I had listened to about 25-30 hours on it over the week and it was sounding great.