Xubuntu 16.04.1 + Atheros AR9285 : wifi KO (boot and reboot)

[jdt37b]

Hello,

With Xubuntu 14.04, network-manager and Atheros AR9285 card, the wifi connections were OK.

Passing Xubuntu 16.04.1, the wifi connection is KO :
At boot and reboot, research Wifi my box fails.
We must stop looking for "Disconnect" and then try to connect to other network visible and new stop this research and then an retry with a new connection with the WiFi SSID of my box, this third time the connection is successful.

Notes:
1) When connected to wifi, disconnecting the user in again and the wifi connection is good in this case.
2) Orders "echo" ath9k options nohwcrypt = 1 "| sudo tee -a /etc/modprobe.d/ath9k.conf" + "sudo echo ath9k" / etc / modules "+ change the wireless channel has improved the problem but have not been settled.
Thanks.

Informations :
Asus X72J - Intel i5 460M - 4Go - Radeon 5470
Xubuntu 16.04.1 64 bits, Kernel : 4.4.0.31
Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
Kernel driver in use: ath9k, linux-firmware 1.157.2
Network-manager : 1.2.0, security wifi : "Wpa et Wpa2 personnal"