WRT1900AC - Sudden/unexplianed connection drops, then "can't rejoin network"

The WRT1900AC has been excellent in my home, providing coverage to all corners of a large home. Has allowed me to do away with the range extenders that I used previously. Recently, users are all experiencing a drop from the network. Devices won't rejoin even though the network appears on the list of avialable networks. If you select the wireless network, it asks for the network key again (it shouldnt do this, of course, but the key is stored on the device or PC), and when you enter the correct key, we all get a "can't join network" message. The only way to fix this is a reboot of the router, then all devices rejoin automatically as it should.
Interestingly, no issues on the 5 ghz network, or on the guess network. Just the 2.4 network.
I have tired the following:
1. Reflashed current firmware
2. Checked for any IP device conflicts
3. Ran inSSIDer to look for channel conflicts -- I have changed over to 11 which is the clearest non-overlapping channel in my area
Recent changes within my environment:
1. new high speed modem (connectivity to the internet is always fine -- I am havng a wireless issue, not internet connectivity...when all devices have been dropped from the network, wired connections still work)
2. update to software on two WEMO light switches...but I doubt they are causing any issues
Of course, when I have time to work on this issue which has been causing problems all week, I find that Linksys support is closed on weekends.
Any suggestions anyone?

Try:
If IPv6 isn't required by your ISP; Connectivity => Internet Settings => IPv6 => Edit => Uncheck Enable
Media Prioritization => Enable => Check
Media Prioritization => Settings and apply accurate Downstream and if available Upstream values; Initially keep all devices and Apps normal priority
Please remember to Kudo those that help you.
Linksys
Communities Technical Support

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WRT1900AC - Sudden/unexplianed connection drops, then "can't rejoin network"

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