I'm running 18.06.1 on a TP-Link Archer C7 v2. Its a very basic configuration where I use an identical SSID on 5 and 2,4GHz and it's basically just an AP. Everything else is handled by a potent Sophos Firewall.
My problem is, that every few days the 2,4GHz radio locks up. I only notice it when devices which only talk 2,4GHz all of a sudden aren't connected via WiFi anymore. All other devices just switch to 5GHz. A reboot fixes this until the 2,4 band locks up again.
Any ideas what could be done to remedy that?
Thanks in advance