Maybe one every few weeks/months, gets stuck repeating one note sort of like a damaged record. When this happens, no control via remote or the unit itself. Have to unplug to get it to stop. Sometimes it self corrects when plugging back in, sometimes have to hard reset.
based solely on the above, assuming your network isn’t an issue, the problem you’re describing is a streamer issue. Most likely the processor is on its way out.
Is there a digital input on the unit…coax or optical? If so, my suggestion would be to order a WiiM pro from Amazon and using it as streamer only, test it out by driving the DAC section via coax or toslink. You can send back the WiiM when done. But this test will rule out the DAC…or highlight it as a culprit.