My audio cuts out half-way through

This has been happening for some time now- it was working fine for a long time when it suddenly began doing this.
I’ve gone to the sound element editor to change the stop time, because it wasn’t as long as I needed it to be. Even after I fixed that, it still does not work. I can see the audio wavelengths on my timeline, but it still cuts out half-way through the audio. How can I fix this?

I just want to tell you that I am trying a lot for that But I have not got any help.