I had a similar issue with the a brand new Brooklyn+ bought from an NYC dealer (I'll leave that anonymous for the time being). The thing would play fine for a short time, and sooner or later loud static and pops would come through. At times, ear piercing volume spikes would occur.
The unit was basically inoperable, and I took it back to the store and they found no issues with it. I tried the device with multiple amps, in multiple rooms, on multiple speakers.
Fast forward several months, still no refund. At the time of purchase in March, I also got a Mytek Clef...though that has never arrived.
For pricey enough equipment, this is unacceptable. The patriarch at Mytek has plenty to improve on.