Pretty sure there’s user error here, as there usually is.
But my M2 MBP with 64gb of RAM running Sonoma 14.3 and DT3.9.4 spent 2-plus hours archiving 14gb of emails from Apple Mail last night. I woke up this morning to a crash notice of DT3, and only 32 total emails with 10mb having been archived. (It appears to have also crashed the MBP as all of the external drives were showing as having been disconnected.)
I have started it again this morning, and will leave it alone as I have to go out for a few hours.
What do I need to look at or provide in order to diagnose? TIA.