Had no failing rigs - until today. Sadly I now can confirm that EthMan still did not detect that the rig was up and running again ("View miner console" worked).
I started to use your logging debug version now and will inform you as soon as I have the error "recorded".
Did you try to reproduce the lock with sending the restart command to a read-only mamangement interface like I stated before?
Yeah I got some logs and found the reason of the issue, I will post EthMan v3.3 within 1-2 days.
Here is new version of EthMan for tests:
https://mega.nz/#!7w4hVKyQ!63zs8B8KBsCnreElYCNz5C0pCLw_5Y_jw9hIQZpWVxY1. Fixed issue with lost connection.
2. Added "retrigger" feature and separate options for every event.
I tried last 3 versions of AMD drivers. No change...
Read FAQ, a question about freeze until any key is pressed.