Keeping with the KISS principle, is there anything at all that runs underneath that specific area in front of that couch that could cause an interruption? Fiber? Coax?
Not the case? Lets start thinking bigger picture. With so many devices in play, where's critical mass? What devices earliest in the sequence of data/info transmission connects everything together? When you identify that, try moving it. Move it again to a 3rd location. That doesn't do it? Next along the chain and move that device.from what I've seen with " I step on x and y breaks" issues on other boards it's commonly been because there's some weird physical issue that defies normal troubleshooting. I think moving stuff is your best bet
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