This has happened to me before in the past and just started again.
One of the things in the log said: "22:46:19: Failed to submit input buffer multiple times already. VCE is probably too slow for current settings." which could be related to this information in the AMD VCE setup: "For older MFT-based encoder: If encoder freezes, encoding quality setting is too high for given fps/resolution. Lower video fps or enable custom settings and set QualityVsSpeed at or lower than 50. Also 60 fps capture has some weird memory usage issues."
Dunno why it decided to start today, but hopefully that log file helps. I think it's going to be limited, at least in my case, to the AMD VCE encoding.