Yeah I had it on for 7-8 hours the first day. I'm still interested in ideas as to what went wrong but obviously i've moved on now but haven't totally given up on Schiit products. If I buy another one of their products i'm SCHIIT out of luck for another year. One product return per year. Maybe it was just tons of external interference crapping up the sound. Hardly seems possible. I live in a 3 story apartment and maybe a lot of Wi-Fi could cause issues, but probably impossible. I think the cell phone/wi-fi interference only applies to rare op-amps. I think at one point I even moved the unit about 5 feet away from any other electronics. Even had it in another room for awhile.
I think maybe i'm too picky and just don't like the sound. I actually like the Magni and Modi though. Maybe one of these days I can try to find a used Bifrost.
BTW my A2 had zero transformer hum. Dead silent for me.
Yeah, I hope it won't disillusion you. I was very happy with my Schiit while I was learning about this hobby. Between the aesthetics, customer service , and value... How can anyone complain about anything coming out of Schiit. That being said, not all gear is meant for everyone (thus the hundreds of thousands of gear combinations out there!).
I haven't listened to the Magni nor the Modi, so I cannot comment, but I know a couple of locals are really happy with theirs. So if are happy, do yourself a favor and try not get upgrade-itis like myself. I am holding out until the new revision of AQ's DargonFly is released and I will be splitting my gear into portable and move up from Schiit to SPL. I certainly recommend Schiit gear to those just starting out. (Or those looking for end game with the next tier up!)
I hope your issue is isolated to just your A2 and doesn't ever surface on the rest of your gear. Best of luck and cheers, it's been fun following and trying to problem solve (on our end ).