Digitakt keeps disconnecting from Mac

Running the latest DT firmware and Overbridge version on a MacBook Pro running Mac OS 10.14 Mojave (it’s an older model, not sure if I can update)

Digitakt keeps disconnecting from the computer, I re-select the DT as Audio Output in Ableton, then a few seconds later it disconnects again.

Getting a little frustrated tbh, has anybody experienced and/or overcome this issue?