According to the About Box I have Personal firewall module 1278.1 (20150803) which, I presume, means that it was released on August 3rd not August 17th.
Is there a newer version? Do I need to enable pre-release updates?
My computer has now been on for over 24 hours and I have not had one crash since disabling the Personal firewall.
I disabled it with the Eset GUI and also unchecked "Epfw NDIS LightWeight Filter" in the network adapter settings.