I've switched to a different brand WiFi USB stick (with antenna for better reception), yet the problem persists. It doesn't seem specific to the type of stick and kernel module. --- The 'new' one: 31: None 00.0: 1070a WLAN [Created at net.125] Unique ID: AYEt.QXn1l67RSa1 Parent ID: 2UT6.7OI4S6n4RF2 SysFS ID: /class/net/wlan0 SysFS Device Link: /devices/pci0000:00/0000:00:02.1/usb1/1-3/1-3:1.0 Hardware Class: network interface Model: "WLAN network interface" Driver: "ath9k_htc" Driver Modules: "ath9k_htc" Device File: wlan0 HW Address: 90:f6:52:e7:89:fb Link detected: yes Config Status: cfg=new, avail=yes, need=no, active=unknown Attached to: #27 (Unclassified device)