Audirvana Studio Locking up Audio Unit

AV Studio takes control of my audio unit (Classe CP800 DAC/Preamp) and does not release it after playback is stopped. I cannot turn off the audio unit using its own remote - AVS turns it back on. I cannot stream from any other application in my system if I have streamed from AVS. AVS shows an “unlock” icon - but it does not release the unit. AV 3.5 works great without any of these problems. I have to Quit AVS to regain control of my audio unit. This has always been the case with AVS - it is not a new problem, but it hasn’t been fixed. Please look into this.