@jd0422 you are almost there. Most smart devices (cameras, printers, etc) need 2.4Ghz. You will likely solve your problem by changing your security setting on the 2.4Ghz SSID to WEP or the lowest security. This process worked for many of us.

Let us know how it works. 

I would do it slightly differently.  Leave your “auto band steer” network just as it is.  DO create a second 2.4 GHz network, with security downgraded to WPA/WPA2.  Use that network for only the “problem” devices.  That way, those devices shouldn’t impact the primary network, and your devices that work well on 5 GHz should continue to work well, and will be more secure with WPA2/WPA3.  

copz1998  If I  change the security then my phone won’t connect.

nc1037  My problem device is a printer.  If I add the 2nd network for that then it can’t talk to my computers on the other network.

If I type the gateway address from my laptop, I only get basic info.  Does anyone know how to get to the internal settings?

Please try it.  I have a printer connected to my 2.4 GHz network, and my laptop which is connected to the primary network can print.