RT-AC5300 Loses bridged connections

[parzival]

My AC5300 is set to use one 5GZ band for wireless bridging and the other 5Ghz band for device connections. I addition the 2.4Ghz band also connects devices, I'm running Asus Merlin firmware version 380.68_4. I've been seeing tiis issue with several releases. I believe the last stable release that did not have an issue was 380.67_0. The symptoms are as follows: Devices connected to the AC5300 function without interruption but all of the bridged connections are lost. Devices connect on 5Ghz-1 and the bridges are connected to 5Ghz-2. The 5Ghz-1 is set to Auto, 40Mhz. The 5Ghz-2 is set to auto, 80mhz There are 5 wireless bridges connected to the AC5300. They are RT-AC66U, RT-ac1900p, RT-ac87 U (2), Netgear R6400. I have experienced no failures with any of the bridges, only the connections to the AC5300. All of the Asus routers are at firmware 380.68_4. The Netgear router is running firmware V1.0.0.26_1.0.14. Last changes I made were to ensure that the time was synchronized between all of the routers and all were getting time from the same ntp server. I also adjusted the wireless bandwidth to 80Mhz from a previous setting of 20 40 80. Prior to that I was fortunate to go 12 hours without requiring a reboot. Subsequently the router has gone 72 hours and just required a reboot. Open to suggestions on this. Thanks.