Thanks Illori. I've been working with my host, trying to figure out what's causing it. Yesterday, when I posted here, core dump files were being created at a rate faster than I could delete them. I had the forum in 'maintenance mode' for several hours, but the files kept coming. Grabbed some ZZZs, and there are no core dump files this morning. I'm not holding my breath. Host couldn't identify a cause, and confirmed I had plenty of headroom in server (VPS) resources.