Hi Matt
I know, it's a few months later, but we have to exact same issue on a clients' server.
Did you replace the ODBC driver on the Win2k12 server (downgrade) and installed 5.2.7 as suggested on https://support.filemaker.com/s/answerview?language=en_US&anum=6420 ?
No more crashes since?
Thank you for a quick note about your experiences.