wireless problem with Band:5GHz CW:10MHz in v5.0rc1

Hello,
Two days ago, I had upgrade at the version 5.0rc1 from 4.10 and I lost the conection.
in the log had, I don’t remember exactly

"wireless,info xxxxxxx@wlan: disconnected, group key exchange timeout"

Today I check the equipment in the client. I didn’t find problem in configuration.
Band:5GHz CW:10MHz ssid:clientvip… profile with wpa2

Later change the channel witdh to 20Mhz in both rb and the link up.

Please somebody had have a same problem..¿It is a bug in this release?

I don’t have captures because was urgent to re-establish the link.

Manuel F.