acid pro 8 drops out with behringer fca1616

I close that project and open another existing project (that was working fine the last time I saved it), then find that the audio to/from the computer is not working. Sometimes I might be working within one project where everything is working just fine. I know this has to be some type software/hardware sync problem currently how I fix this problem by first Quitting and then Re-Starting Cubase. To note: Both the MacBook Pro and the Behringer will be indicating that everything is connected via LED etc, I can even play Mac system sounds through the Behringer, just no audio in/out within Cubase. Mind you, the audio in/out on the Behringer itself will be working fine, I can monitor the audio inputs/outputs directly no problem, its any audio feeds to/from Cubase via Firewire that will not be working. Within Cubase all the software level meters/monitors will be indicating that audio is “being sent”, as if I “should” hear something – but active signal will not be showing on the Behringer. This is for recording or playing audio tracks, playing VST instruments, etc basically any audio to/from Cubase, nothing will be working.

What I am noticing is that sometimes, I have no audio input/output capability from the MacBook Pro to/from the Behringer, but only within the Cubase software. I’m running Cubase Artist 8.0.10, MacBook Pro, with a Behringer Firepower FCA1616 Audio Interface connected via Firewire.

Sorry in advance if this is not the correct place or format for this.

Acid pro 8 drops out with behringer fca1616