No, you are misunderstanding. I realize it is not a consistent signal.
With each new 3D disc I put in my Oppo player, I allow for the display to detect it. Then I sync the eyewear.
The display is not detecting the 3D all the time.
I am still going through more discs today trying to replicate the problem again and making certain that simply pushing the 3D button on the remote is the answer.