Sorry, I can not reproduce under latest platinum, latest z3ta, latest win10 (and i7).
Since you mention you have short audio drop, open Windows resource monitor and watch CPU monitor (or change Sonar buil-in monitor to total system mode). When you play, do you see a heavy load on CPU? Is there difference between GUI open and GUI Closed?
There was several reports before that Z3TA reset settings under different conditions. I can not remember we have found the way to reproduce. And till that is done, there is no chance it is fixed... So please do not give up.