render job failed. again. daVinci Resolve, exporting to DNxHR, fails at 37%:

Render Queue
Job 1 - Trailer_v3 H.264 | 3840x2160 | 23.976 fps Completed
Job 2 - Wedding_Final H.265 | 3840x2160 | 25 fps | stopped at 01:12:44:08 Failed
Job 3 - Wedding_Social_9x16 H.264 | 1080x1920 | 25 fps Waiting
Playback in the timeline works fine. i dont understand why export doesnt. Any debugging tips?
Ive exported many projects without issues before. This is teh first time it fails like this ;) Im hoping soemone can tell me how to find whats actually breaking... i can share render settings or logs if that helps.
