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ARC problem with UN65KS800D and Sonos Beam sound bar.

This seems to be a very common problem with Samsung 800 series. The ARC connection worked fine for 5 months and then lost connection. Tried the 10 minute deposed, re connecting both input HDMI's and ARC. The ARC connection will not work with 2 other sound bars, Yamaha and Klipsch with ARC. All 3 sounds bars work with ARC just fine on both my Sony TV's.  
hmmm , Maybe a red flag. I'm going to try to return this Samsung at Costco with the concierge warranty plan. Very frustrating TV.