As per the topic, my Replay recording is stopping randomly. I'm stumped as to the root cause. Here's a demo of it:

(apologies for the potato quality, I used OBS studio to record and I almost never use the app...


Note at 1:20/21 in the recording, the decklink camera on the right seems to have some sort of glitch, and that's when the recording stops.

Here are some details of my setup:

Software
vMix 21.0.0.47 x64
Blackmagic Design Desktop Video 10.10

Hardware
Decklink Duo 2
-> SDI 1 = Input 59.94fps
-> SDI 2+4 = Output 59.94fps
-> SDI 3 = Input 59.94fps

SDI 1 is receiving the AUX output from an ATEM TV Studio HD, whereas SDI 3 receives its input direct from the computer generating the image (HDMI via a Blackmagic HDMI to SDI converter, again at 59.94fps). I have a feeling that the replay recording is stopping because of the glitch on the SDI 3 input but I'm not sure this is the case, and I'm also not sure what could be causing the glitch itself.

Any ideas as to how to solve this would be hugely appreciated!

An update. There's definitely an issue with the input, so I've switched camera input to an NDI capture input instead. However, I still have a problem with Replay recording stopping. Whenever there is what I've been calling a "state change" on the PC that's got NDI capture running on it, replay recording stops. Let me explain:

I'm doing an esports recording. The source PC runs Heroes of the Storm, and has Newtek's NDI Scan Converter running on it. The game output has several states:
1. Draft view
2. Game view
3. Post game view

The normal process has the game go from 1 state to the other in sequence. If I have replay recording at the time of switching from one state to another, the recording stops. However, the recording light remains on - it just doesn't write data to the disc. To recover, I stop the recording and restart it, and we are back in business.

I'm confused as to why the recording stops at all though. In the past I've been able to start replay recording at the start of a broadcast, and then stop it at the end - 6 hours later of uninterrupted recording. Now I have to constantly check back after each state change and restart the recording. Surely this is not normal?