Overbridge Connection Unstable

I’m having some issue with my Overbridge connection. My Digitakt runs ok in ableton with overbridge when i have no external sound sources connect to the Digitakt. The connection becomes ‘unstable’ when I connect a synth into either of the input jacks of the Digitakt. I can see the connection ‘initializing’ over and over in the overbridge engine. Any ideas what is going on?