WiFi interference, DFS events, APs to close, network loop.
And some links to topics describing similar symptoms:
This one of very lately, maybe @Alta-Jeff can shed some light if it was solved and how:
Edit: Another idea is that one or more of the more or less advanced settings for the specific SSID doesn’t playing well with the specific client, like fast roaming, PMF, IGMP Proxy, BSS transition, etc.