I had the same issue with the M10 V3. Popping noises whenever I selected sources on the touchscreen, switched on/off the M10, swiched on/off a connected cd player and whenever I changed tracks or turned the volume up/down on the app. Basically whenever I did something to just operate the damn thing. Tried a second M10, different speakers, same issues. Tried it at the dealers store, same issues. The only time when I didn´t get those popping noises was when I used the M10 as a pre amp and connected it to another amp (Class A/B). But that is of course not the use case for this rather expensive amp. It´s a shame, I liked the sound of it.