Can you give more details on how is the 窒格 or in which bluray? I never experience this for all blurays or DVD in my 500a. Have you try to exchange another BR machine ? or using a PS3 for an AB test ? and does the same happen for DVD ?
I think you have mis-open/closed certain function in your TV coz I'm also using PS3 and 51fd both not exist your situation. C hing have you follow certain suggested settings other 500a c hing posted before to try ?