I'm having an same issue with my QN65Q9FNAF. I've had apps like Netflix and Fubo TV get a network connection error even though I have an excellent connection with a 100Gb wifi service. No other TVs including another lower model Samsung, in the house get this error. I literally have to unplug the One Connect to get the error condition to clear and resume watching. In the case of the Fubo TV app, even after powering down the TV, the app gets the error condition after 5 minutes of viewing.