We have put together a short survey to capture your feedback in terms of what BT can do when you experience home Wi-Fi issues. We would appreciate it if you could take a couple of minutes to complete a short survey. Read more from here, Fix my home Wi-Fi
There's not really any great advantage in connecting at 5Ghz. It is faster but has a shorter range than 2.4Ghz, however, the speed is only of use if you have a very high speed broadband connection or use a NAS to stream on your LAN.