I have run with the latest code, version 2.1.9(9), and had some hang conditions. I have been communicating with the author of EthernetENC and
he made some suggestions on where to add some debug code. I have created a version of 2.1.9(9) with the debug code but have not hit a hang yet
after 2 months of running. I am debugging with EthernetENC now, and no longer the older UIPEthernet. Same author on both cases.
I wish you well on your health issues.