I tried a complete uninstall and reinstall of v4.3.3.2 and re-entered settings from scratch. Still didn't help the Reolinks. Even tried the Generic name. I installed v4.3.2.5 and all is well.
Unchecking rtsp/stream timecode and dropping fps in cam settings didnt make any difference. Went back to v4.3.2.1 and the fps went back to about 29 instead of 4.
I have the same issue with RLC-420 and 410's. I was already disabled for Intel HD HW acceleration. Not seeing the second option mention above in cam properties. It also has occasional live view distortions (melting affect). BI v 4.3.3.2