I was extremely disappointed to find out that the TV doesn't support 5Ghz, though it supports WiFi 802.11/ac. Is it locked in software level, or it is a hardware limit?
This is an old post but hope my story will help.
Samsung TV appears not compatible with 5Ghz if your Wifi Channel is higher than 36. I've been having similar problem. I have unifi AP so I was able to change my channel to 36 (tried 38 and 40 with no luck). 36 channel is the only one my Samsung TV can connect to. Hope this help.