I have a SAMSUNG UE43RU7400 SMART TV that I purchased November 2019. Until a month ago everything was fine.
I am now having problems watching, Netflix, Prime etc using WiFi (buffering and error messages). No problem connecting to my local network but Internet connection is intermittent.
I have another older Samsung TV with which works fine even when placed in same position as problem TV . Therefore the fault is with the TV not the router set up.