Chrome OS Version: <From about:version: Platform R54-8743.28.0.>
Chrome OS Platform: <Lars>
Network info: <Wifi>

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:

The following test pass when run independently but fails while running wifi matfunc suite. 

1) network_WiFi_DisconnectReason.ap_send_chan_switch
2) network_WiFi_DisconnectReason.ap_gone
3) network_WiFi_DisconnectReason.disable_client_wifi
4) network_WiFi_DisconnectReason.deauth_client
5) network_WiFi_DisconnectReason.switch_ap

logs @ https://pantheon.corp.google.com/storage/browser/chromiumos-test-logs/bugfiles/cr/638283/Comment_26_logs/

Unconfirmed for now. Will check and update, if it is happening for other boards.