I’m having the same issue. Bought a KS8500 from Costco before Christmas. Using ARC with an Onkyo TX-NR757 receiver, with a Directv Mini Genie, Apple TV 4K and Sony Blueray player. Everything worked fine for a couple of days. TV controlled volume on receiver and now stopped working. Gone through the 10 min unplug/reset process multiple times and now TV won’t recognize Apple TV, receiver or Direct TV Genie. Replaced a 13 year old DLP a Samsung for this tv. Firmware is up-to-date on all components. Frustrating that it works sometimes. Going to try one more time, them if same, return to Costco for a refund.
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