Hi there, I had same issue with occasional connectivity loss between my OLED65B6P and LAS465B bar. Every few minutes, intermittently I'd lose sound for a second, or two. I replaced that thin cheapie optical cable that came with sound bar and used my old, fat Belkin optical cable. Over two hours of TV watching, not a single drop out.
I think that thin cable is not insulated well, or maybe has low optical quality fiber in it, same as fishing line:)
Anyways, hope this helps.