Wireless technology is problematic.
Wireless technology is problematic.
Your 2.4GHz band is quite congested, so try to move all your wireless gadgets to the 5GHz frequency. This can be achieved by setting a preference for 5GHz signals in the adapter settings (especially in Windows) or creating a distinct SSID for the 5GHz network and instructing your devices to join it. Not all devices that only support 2.4GHz will gain from this change. It seems they aren’t top priority equipment. Opt for a channel width of 20MHz in busy wireless areas. Your 5GHz range is decent but needs better configuration. Switch the channel to 64 or higher. As observed, beyond that it’s essentially open. You may also opt for a wider channel (40/80MHz) as long as it doesn’t clash with other networks.
You have a situation where your current router relies on an ADSL connection, while most modern routers use standard Ethernet. The modem you're using only supports ADSL, which limits your options. If you wanted a different router, you'd need something that supports both technologies or offers a compatible setup. You mentioned considering an ASUS RT-AX82U with an Openreach modem found on eBay. It seems there might be compatibility concerns, but the price was comparable to the RT-AX82U. If you have further questions or encounter issues, feel free to share. Thanks.