P: Can't export multiple video files at once

I'm using Lightroom Classic 11.2 on an iMac with OS 12.2.1.

When I select several .avi video files and try to export them as .mp4 video files via a preset which saves them to a specific folder, it will export a couple but then the progress bar just stays the same and it never finishes the rest. It's like it gets stuck.

Expected result: 5 or 6 (or more) selected .avi files get exported to a folder as .mp4 files.

Actual result: 1 or 2 .avi files get exported to a folder as .mp4 files and the rest never get done while a progress bar stays on in LRC until I cancel the operation (I've waited 20 minutes and 10 minutes on separate occasions.)

I end up cancelling out and exporting them one at a time which works and is faster but is labor intensive. It prevents me from exporting more of those files.