Silence when exporting audio

Strange error:
When exporting and listening to audio tracks sometimes appear was silence.
(The original audio track is in order).
I tried different drivers and different settings, restart, tried other formats …
What could be wrong?
Безымянный.png

What version and build of Cubase are you using? Are there any plugins on the tracks (particularly trials, some trial versions of plugins include “dropouts” on purpose)?