Unplugged or just turned off?
If it’s plugged in, it’s still active on Wi-Fi even if it’s turned off.
Since 2017, Microsoft has used its own proprietary frequency for controller communication. It’s in the 2.4 band but a little higher than Bluetooth so it’s supposed to have fewer problems with disconnects.
One problem that still affects it is USB 3.0 interference, so I’ll just toss that in here,
https://www.reddit.com/r/xboxone/comments/i5z82l/after_two_years_i_finally_figured_out_what_was/
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That’s a good point, it was just turned off and not unplugged. But I just turned off the WiFi on the TV to see if that’ll help.
I did read about USB 3.0 interference and I’m not sure if my new TV has that type of port. But you have to imagine a ton of people would be having this problem since the Samsung S90C is a very popular gaming TV.
Who knows, maybe my Xbox Series X is having hardware problems with its wireless controller communication system. I have no idea how that would get fixed, other than buying a new console 
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I did another test. My daughter turned on the Xbox earlier and was playing, immediately there were controller problems with disconnecting/reconnecting (she was yelling at me because it was messing up her games 
). I turned off the WiFi on my new TV and the problems were still happening. So I decided to unplug the V2 hub and take out the batteries. I played for a little over an hour with the hub offline, there were ZERO controller problems.
When I put the batteries back in and plugged in the hub, my controller immediately disconnected/reconnected. At this point I’m almost positive the hub is causing interference with my Xbox controllers, I don’t know what other test I should run to further isolate the problem.
I just don’t know why all this started unless the hub’s having some kind of hardware problems or a software update messed things up.
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I had the same issue and wasted hours rebooting my V2 hub and unplugging devices.
I then read about the possibility of my WiFi router 2.4GH channel interfering with my V2 Zigbee channel. I have a TP Link X60 router so can’t manually change the channel but when Optimizing the Wifi setting the router changed my 2.4GH channel from 10 to 2.
Immediately all of my previous unresponsive Zigbee devices came back on line.
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