I experience the same problem but only on 5G (if it is happening on 2.4G, I have not noticed). I only have 4 devices on 5G and another 4 on 2.4G. The System Log indicates it happens randomly about 4 times a day. 5G clients need to reconnect or fail-over to 2.4G. Fortunately client re-connection happens automatically and I almost never experience any consequences except for occasionally losing my cell phone’s 5G “WiFi Calling” phone call connection that may be in progress.