It seems to me that the channel configuration for Switzerland is broken. If I try to manually configure "channel=44", which it used to select automatically, I get this error: Mar 03 21:37:27 winti hostapd[21343]: wlan0: IEEE 802.11 Configured channel (44) not found from the channel list of current mode (2) IEEE 802.11a Mar 03 21:37:27 winti hostapd[21343]: wlan0: IEEE 802.11 Hardware does not support configured channel