I'd like to throw my 2 cents in here as I was an owner of the Ref 5.32 and now have the Master 7 and I had three issues along the way that made me feel I had a defective unit. In each case I emailed back and forth with Kingwa multiple time, he was extremely patient, and he kept suggesting things that may be issues with my setup rather then the gear. I also had some stress with the return policy and shipping costs.
The language and cultural barrier did make the communication a bit more stressful then with local dealers. But I think in Kingwa's defense he was being very diplomatic and perhaps too patient and didn't want to push the problem towards me as hard as he perhaps should of. As it turned out, each of my issues was user inflicted, was a setup issue or other hardware problem, and things worked themselves out.
Every situation and problem is different, and I can empathize with anyone having an issue with an expensive piece of gear that they just want to enjoy. Sometimes there is a real defect that needs some attention from the manufacturer and a return is warranted. But Kingwa is very confident about his equipment and I'm glad he held me off from returning my dacs as today I am a very satisfied customer. One thought that always allowed me to keep a cool(ish) head is that I turned to Audio-gd to save some money and get some world-class audio gear at the same time. So I had to accept a little more stress then if I had of gone to a local store.
Anyway, hope things work out in this example. I'm pretty sure you will be happy one way or the other when all the dust settles.