I can't find anything online about this. Recently we've been having issues when exporting to XDCAM HD 422 mono 24bit 4 channel. This doesn't happen in our H.264 exports.
There seems to be a somewhat random, less than 1 frame audio artifact that is similar to a bars & tone, but for about 1/4 of a frame at or around the beginning / end of our program. We've even had it pop up randomly about 1 minute in. It's extremely difficult to duplicate as this doesn't happen on just one computer this has happened on multiple computers. We use Team Projects and a NAS for media over a 10Gb network card.
I realize that Team Projects doesn't play nice with NAS, but this never happened before and we've output dozens of programs before. Now all of a sudden there are issues. We've output about 6 programs in 2 formats (for air and split track) on 15.0 and then in the last 2 episodes this happened. Each episode is a separate team project with separate media. When we pull up old episodes to output promos and additional XDCAM outputs we've not had any issues pop up. We upgraded to 15.2 thinking this would help, but unfortunately the issue still exists, although to as far as I've found it's only a single artifact in each output as opposed to 2 or 3.
This has happened across multiple computers with different specs:
Comp 1:
i7 6600K
32GB 2666 mhz ram
GTX 1080
Comp 2:
i7 8600K
64GB 2400 mhz ram
GTX 1080 TI
Comp 3:
HP Z4
i9 9820X
64 GB 2666 mhz ram
RTX Quadro 4000
Comp 4:
i9 9900K
64GB 2667 mhz ram
RTX 2080 TI
Comp 5:
Ryzen 9 5950X
64GB 2666 mhz ram
RTX 3080
  
you can see below the multichannel sequence which has no audio where the artifacts are happening:
followed by an artifact in a mixdown prior to program starting
followed by an artifact in a split-track after program starts but before the dialogue begins.
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