Repair will not work on table "thread" if marked as crashed and a connection is persistent even after reboot of SQL. I've had the same table crash on me several times in my career with this same exact issue.

It will continue to 1.) Timeout, or 2.) Remain crashed.

Granted, I was able to repair the table in the past. However, once it is un-repairable (according to Raven's statements) your only option is to overwrite it with an existing backup.