Sound fading out

Im working on a project in cubase 10, but got some problems today.
Some of the tracks just fads out suddenly, there are no automation or plugins that causes it as far as I can see.
Its probertly just a small thing, but I can’t find out what causes it to happen.
And it’s starting to annoy me big time.
So I really hop someone have any idea what it could be?

best regards
Svenn Tore

Hi and welcome,

Make sure you are not using any plug-in in DEMO/Trial mode, please.

Also double check, if there is no Gate plug-in (or any Dynamics plug-in containing Gate module).

Thank you, I figured it out finally.