Devices Not Connecting To 2.4ghz

After hours of troubleshooting and about a half dozen factory resets, I was able to resolve my issue.  

Does anyone remembers the google program 'Namebench' from several years back?  Well, it turns out that I was still using my DNS / Alternate DNS server addresses from almost five years ago.  Everything worked great and I had not issues on the XR500 until my ISP went down for maintenance / upgrade early Thursday morning.  After the maintenance / upgrade was complete, I had to call my ISP in order to get online as they needed to do some things on their end.

FAST FORWARD >>>>>>>>>>>

I noticed after doing factory resets, all devices on my home network seemed to work flawlessly.  After loading a recently saved CONFIG file, I once again had issues with the same devices (connected to home network / unable to communicate with server).  Another factory reset,  and this time I set up my home network from scratch, using the almost five year old DNS / Alternate DNS server numbers.  The issues persisted.  A performed a few more factory resets, trying differnet configurations, and I was still having issues.  On a whim, I decided to "Get Automatically from ISP" the "Domain Main Server Address".  Guess what........I"m BACK IN BUSINESS!  :smileyvery-happy:

I, like most others, am still have random disconnects (usually Nest Cam during the late night hours) that are very brief (just a few seconds).  I've noticed no random disconnects of any LAN connceted devices, including both the Xbox One X and Xbox One S which are both set to 'Instant On'. 

Ultimately my problem was a result of 5 year old 'Domain Main Server Addresses" I was using from the Namebench program.  I'm now using / trying some recommended DNS Server Addresses and they seem to be working great!  Thanks to all that helped me with troubleshooting this problem.

I hope that anyone having issues like mine might be able to use this information as a reference.