Problem solved: I deactivated 'Power saving options' for WLAN (from 192.168.1.1), which also deactivated WLAN it-self. After reactivating WLAN from the device (white button), the 2.4 GHZ wlan is working again. Looks like a bug, maybe due to the last firmware update UPDATE: Well, it works but temporarily. Because the 'Power saving options' is reactivated automatically UPDATE2: In facts, nothing to do with Power Saving options. The bug/defect is still there. Workaround: 1) disable wifi on router (external button) 2) wait 8 seconds 3) enable wifi on router (external button) 4) connect
My router is configured with 2 wlan networks with different names and passwords (NO wlan steering). This morning the 5GHZ wlan works properly, but the 2.4GHZ wlan is not working anymore. It's detected, properly authenticated, but the connection fails.