I am still having the problem with paring going away after awhile. But one thing I have noticed is that I can re-pair Indigo to the displays now at any time without an error. I don't know if this is the result of an update of the TVs' software or your changes. What this suggests is that the Sony Bravia plug-in can just pair with all the known devices on a schedule, e.g. every 24 hours, and everything will work just fine long-term.
Stupid question, but did I ever release a version that will handle your TV's differing response as I stated below?
Okay, I see the issue here... the plugin expects an "Unauthorized" response to trigger it to automatically pair, but it is receiving a "Forbidden" response from your model... clearly to the television this means you must re-pair since you issue the pairing command and re-execute the same command. I'll get that added to a new version and get you to test it out.