Ren Wu

This usually comes down to Bluetooth interference that shows up more in docked mode. The dock, TV frame, routers, and even USB 3 drives can add 2.4 GHz noise, which lines up with your couch setup. The fastest way to make it stop is to run the Pro Controller in wired mode so the radio is out of the equation. On the Switch, open System Settings, go to Controllers and Sensors, and turn on Pro Controller Wired Communication. Then plug a USB C cable from the dock to the controller and it will play wired without dropouts. If you need a dependable long cable, I like PDP Gaming USB-C Charge Cable. It is 8 feet long and supports data so the Switch treats the Pro Controller as a wired pad, which sidesteps the flaky wireless after the update. If you still want to stay wireless, try moving the dock a bit away from the TV and any router or USB 3 devices, update controllers in Controllers and Sensors under Update Controllers, and power cycle the controller by holding the sync button for about 15 seconds before re-pairing. Changing your Wi-Fi to 5 GHz or to a cleaner 2.4 GHz channel can also help. But for couch play, wired mode with a long cable tends to be the most reliable fix.