I have the same issue when using the USB DAC playing DSD file , occasionally it produce a large crashing sound ..I found the problem: I was using USB-C <=> USB-C cable. When I changed it to USB-C <=> USB-A everything started to run smoothly.
But I am encountering some serious problems using it as a USB DAC. It's very common in the middle of songs to have some relatively loud bursts, especially when I'm playing DSD files. Can you fix this via firmware update? This is irritating and can even damage my hearing!
Other questions I have are:
As USB DAC it doesn't unfold from MQA?
As USB DAC it can't go up to 32bit/768Khz, why?
I bought the M6(21) to be my DAP and my only DAC for everything. If these problems continue I will sell it soon.
I would really appreciate an answer from you @Shanling
any idea ? Thank