Can only connect to guest network
My network had been working fine for over a year, but over the past month or so my devices started intermittently not being able to connect. Updating the firmware did not help. Finally, today, I found that I'm no longer able to connect any device at all. On my phone it says IP configuration failure. I tried some troubleshooting steps I found from Googling, such as restarting the Deco, modem, phone, and forgetting the network, but no luck. If it matters, I've always only used the 2.4 GHz band as my smart devices only work with that.
Fortunately, all my devices can connect to the guest network.
Any ideas on how to fix this problem?