Lumen randomly gets flicker in runtime Movie Render Queue output

I have an app that customizes a sequence and renders it through MRQ at runtime. I can render the same sequence dozens of times with the same result, but at some point a flicker will start, almost like Lumen temporal accumulation restarts every other frame, and then won’t go away without closing and restarting the app. No render settings change. I’ve tried turning off screen traces for screen probes and reflections, it gets rid of the flashing but still leaves a super noisy, unusable render so there’s more going on. Happens with all AA types. Started in 5.1, just updated to 5.3 and same behavior. Anyone encountered this or have any insights?

Bad render:

Good render:

Have you found the answer yet? I’m also troubled by this problem.

No, the only thing I found was that it started happening after the app was open for a period of time, like more than 20 minutes, so we had it restart more often.

Yes, I also posted about this issue, but it still hasn’t been resolved.