No sound in Cubase on tracks with volume automation

Hi alexis
Cubase 8.5

as u see above its a problem that are repeating for years again and again

now i dont know what to do, this project is very important for me,
As soon as I open the project
after 30 seconds or so, the audio stops completely.
There is a sign of the Level meter, but there is no sound at all.




cubase 8.5
intel core i7-4710HQ cpu 2.5 ghz, 16 gb ram. win 10 64-bit. ssd HD. Komplete audio 6.