@Nick-B that's very unusual. I assume you've swapped the batteries and the Omega2's if you have 2 sets? If that is the case then you've ruled out the battery and the Omega2, so it must be a damaged Power Dock 2? Did you try all of those combinations?
Posts made by Bruce Muff
RE: PowerDock 2 very unstable
RE: Anyone Successful Using BLE Dongle, Bluez and PulseAudio?
David, did you check out the project in the new Omega2 Project Book, Vol 1? There is a BT Speaker project starting on page 277.