R6700 Losing ability to connect at 2.4Ghz

I have an R6700 with the latest firmware (.36) on it. What has started happening since the last update is I will notice that all 2.4Ghz connections will drop off the connection list on the router. Then after a bit, anything trying to connect via 2.4 Ghz will see the SSID, attempt to connect but not get an IP address. If I reboot, it returns, but only for a while until it happens again, usually a couple of hours. What has changed is I have added a few more things (19 in total) that connect in the last week. I have done a hard reset, change the channel from auto to the best I can see via wifi tools for my area. Any help? I am losing my mind.