D5 crashed while rendering 4k animation, becomes unresponsive


I successfully rendered a 720 and a 2k animation, but when rendering a 4k, the progress bar stalled at 61% (although the animation actually did finish). Afterwards D5 was kind of frozen - I could not exit the animation mode, but could however change the views in the viewport. I couldn’t save either, except for when I quit the application. Upon exiting, I was asked to save the file, and then the attached error message popped up. What does it mean?
FYI, I I’m running latest D5 v2.10 on a Win10 Pro i9-7900X 3.30Ghz 64GB RAM with 3080Ti


these are my GPU-Z specs