Does that issue trigger 5GHz failover and is able to soften the blow?

Dropout is from 1 to 5 seconds 20-30 times a day regardless of configuration and system version, even without bonding, 60GHz only. 5 clients Cube60 Pro ac. Clients distance between 50-70 meters.

I have the same problem. From 6.49.6 to 7.6. Twenty times every day. 1x CubeSA 60Pro ac + 5x Cube 60Pro ac....