I'm having issues with the audio in a clip. Davinci Resolve

I'm experiencing a problem where the start of the clip sounds perfect, but after X seconds, the volume fades until it disappears completely. What's odd is that in the original clip, the audio is consistent throughout.

In the Mixer, the A1 track keeps "dancing," but the "Bus1" track stops showing any signal.

Has anyone else had something similar happen? I thought it might be a bug in version 20, but it seems it’s not.

Can you help me, please? I’ve spent 2 hours searching for information and trying to figure out the cause, but I’m stumped.

Things I’ve tried:
- Switching from Stereo to Mono and back
- Applying the AI Automixer from version 20
- Deleting the clip and re-uploading it
- Closing and reopening DaVinci

Thank you!

Please indicate Resolve version, operating system, and computer spec (including GPU with driver and Audio IO configuration). Include this information in your signature to assist troubleshooting.

What is the source format and codec?