Try disabling Fast Roaming. It cured numerous connection problems, improved stability, ping response and surfspeed.

@magne Confirmed. Disabling Fast Roaming gets rid of the error messages. It also improves pingspeed dramaticly. Enables resulted in 33% packet loss on my M4S system. It also cured a problem I had...

@gauravmuk A solutiuon that also works great is a (free) account at nextdns.io. This is a private DNS service that can fiter websites for example adds, but also themes like adult material, violence....