Loosing audio playback

[#1]

Hello, I Have big problems with PP 2020.

During playing a sequence, I loose audio playback sometimes.... some tracks play well but not all tracks together.... I never had this problem with previous versions.... I'm a prefessional Editor for 28 Years.. so I Know how to set up my software... but with PP, there is more and more issues... Tired !!!!

Any ideas about Audio issues

I join a copy of a very simple timeline with does'nt work well......

....???

[#2]

Hello, I Have big problems with PP 2020.

During playing a sequence, I loose audio playback sometimes.... some tracks play well but not all tracks together.... I never had this problem with previous versions.... I'm a prefessional Editor for 28 Years.. so I Know how to set up my software... but with PP, there is more and more issues... Tired !!!!

Any ideas about Audio issues

I join a copy of a very simple timeline with does'nt work well......

....???

[#3]

Delete the Media Cache and Media Cache files:
https://community.adobe.com/t5/premiere-pro/faq-how-to-clear-your-media-cache-in-30-seconds-in-premi...

If that doesn't work,try resetting the preferences:
https://community.adobe.com/t5/premiere-pro/faq-how-to-reset-trash-preferences-in-premiere-pro/td-p/...

If that doesn't work, try resetting the Workspaces:
Reset a workspace
Reset the current workspace to return to its original, saved layout of panels.
1. Do one of the following:
• Click the Workspace menu icon and select Reset to Saved Layout.
• Choose Window > Workspace > Reset to Saved Layout.
from here:
https://helpx.adobe.com/premiere-pro/using/workspaces.html

If that doesn't work, try Preferences > Audio Hardware and set Input to None.

If that doesn't work, try creating a new project and import the old one into it.