Not sure if this is of interest but I restarted our CMs, QM and 29xx routers over the weekend just gone and have not had any instances of this problem recurring yet. Only been two days but here's hoping.
Did this issue show up again after a system reboot? I'm running into the same issue in an identical environment. The audio in both the Archive and Screen recordings go out of sync after about 10 minutes - off by about 5 seconds for the remainder of the recording.