Audio stops when I change MIDI/instrument track

Hi i run Cubase 10.0.30 on W7 64bit.
I Notice this issue (or wrong setting);Audio drops/stops when I change MIDI/instrument track. Basically in all project, i tested it in a simple new porject with just two midi/instrument tracks!

See attached video file or go to this link:
https://www.dropbox.com/s/p2xm35rey4a4vnz/drops%20C10.mov?dl=0

Please give me any helps or support