I am having the audio delay issue too on my UN55NU7100FXZA. My sources include a TiVo Bolt, AppleTV (1080p), and a flash drive (via usb) with video files on it. I then connect the TV via ARC to my Yamaha YAS-108 soundbar. Happens on all sources. Tonight I am going to first make sure the 1270.6 firmware has been installed (pretty sure I did that when it was released in August), then as a test I am going to disconnect the soundbar and see if the issue persists on the TV speakers. If not, then I will try resetting my soundbar. If it does persist to the speakers I am not sure what I will do as my warranty expired at the end of July. My wife is not bothered by it but the teeny bit of delay that I can perceive is annoying to me.
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