You're not alone... my server has crashed two times in the last 72 hours.
Just stops working... a reboot via IPMI is the only solution it seems because even ssh isn't working.
Supermicro X9DRL-3F/iF , Version 1.01
American Megatrends Inc., Version 3.3
BIOS dated: Thu 12 Jul 2018 12:00:00 AM CEST
2x Intel® Xeon® CPU E5-2620 v2 @ 2.10GHz
128 GiB DDR3 Multi-bit ECC