@RetroMike 

Hi, thanks for posting question in our community.

You may login the web management interface of the Router, go to Advanced > Wireless > Wireless Settings, change the wireless channel into another one.

And, for 2.4GHz wireless client devices, adjust 2.4GHz channel width into 20MHz, for 5G wireless client devices, adjust 5GHz channel width into 80MHz or 40MHz to avoid interference.

It is suggested to temporarily disable advanced router features like Quality of Service (QoS) that may be causing compatibility issues with specific client devices.

Does the unstable connection issue happens on all your wireless devices? How often does the issue happen? 

When the issue happens, can your devices connect to the wireless network but have no internet, or even can not connect?

Can rebooting the router manually fix the issue? Or the router can recover back to normal automatically after a while? 

You more detailed feedback would help to analyze the issue better.