Group key handshake timeout

本日以下のエラーが発報し接続されていたノードが一斉に切断されました。

そのあとは再度接続しなおして事なきを得ましたが、

以下のエラーはどのような状況で出力されるのでしょうか？

（一部伏字）

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[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:3f:39 deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:3f:39 had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:3a:f2 deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:3a:f2 had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:63:9d deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:63:9d had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:fd:6c deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:fd:6c had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:c0:72 deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:c0:72 had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:29:73 deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:29:73 had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:93:9a deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:93:9a had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:91:ac deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:91:ac had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:41:e4 deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:41:e4 had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:61:0b deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:61:0b had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:92:00 deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:92:00 had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:07:fb deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:07:fb had an authentication failure, reason 17
[Sep 28 2020 13:36:59] [info] hostapd[7973] STA xx:xx:xx:xx:4b:08 deauthenticated for reason 16: Group key handshake timeout
[Sep 28 2020 13:36:59] [info] hostapd[7973] Station xx:xx:xx:xx:4b:08 had an authentication failure, reason 17