It seems that it is easy to not notice the crash. The sprinkler program continues
to run as expected. The web page cycles between “network error” and normal.
The web page otherwise looks OK. If you ping it you will get an error message.
The firmware from Stefan may have worked the same. Now, I cannot be sure.
Would it be possible to enable the WiFi at the same time at a different IP address.
If you directed debug info to the WiFi connection I could record it for you.
Could I get a console on the WiFi connection? I could even give you a remote
connection.
I did buy 2 ENC28J60 modules, I can try the other one.
I may try using the monotoring feature of my Dell switch with WireShark.
That will require some study on my part. I have not used it before.