Rekordbox 6.5.3 stops recording mid set on OS 11.8 with plenty of hard disk space

Recording a two-hour set on performance mode today and Rekordbox stopped the recording 41 minutes in.

• Using only local music files I own.
• Full read/write permissions on the drive.
• Approx 386 GB available on disk (other 60-min+ recordings take fewer than 2GB).

What is the solution? Is this a bug? I noticed a couple others having similar issues, with no apparent resolution:

1. 10 Oct 2021
2. 27 Sep 2021