No sound on instrument track

Here is what I got:
I make an instrument track, record on it, everything is ok. I quit the project. Then I come back to it, and there is no sound on this track. I solo it and then I can ear it. I unsolo it, and no sound. So far, the only solution (that is not one) I found is to do it all again and then all is ok. Any ideas?
Thanks in advance.

Maybe something is getting muted. A screenshot would probably be the easiest way for someone to spot the problem.

Thanks for your answer. I’ll do a screenshot next time I got the problem. I really looked everywhere, trying to find a difference between a working instrument track and one that doesn’t any more. But I can’t find any. The tricky thing is that when I solo the track, I ear it again…