New xDSD user as well (rev 2 w/USB-C) and experienced something like the pause/stutter you describe (it was almost like a pop every 15 to 20 seconds). This only happened after I updated the firmware to 5.3c and only when listening to MQA tracks. I fell back to 5.3 and everything was fine again. I’m sticking to 5.3 because I think the 2 filters sound great (didn’t notice much difference with the GTO filter because it sounded good too) but I like the KHz LED to show the color applicable to the input rather than show the same color for everything except MQA, caused by the upsampling for the GTO filter.
As for the power problem you describe, I have not tried any USB-C chargers but have had no problem using USB-A chargers with the included A-C cable. In fact with a 5v/1.8A charger charging speed was quite fast.
I may go back to 5.3c and do more troubleshooting and see if it’s just certain MQA tracks that skip/pop (e.g., 24/44.1 -> 24/88.2 vs 24/48 -> 24/96).
@iFi-Audio, is there any risk going back and forth multiple times on the firmware?
Cheers
Gus