Initially there was this stick S *****. Almost every second closed the connection and always changed the frequency band. Once in the settings of the program FRITZ! WLAN Roaming behavior among the settings to "OFF" was asked, it works now SUPER !!! [...] In general, I find it especially in an apartment building with many wireless networks around a good idea to have some running on 5GHz, which is simply running smoothly. -> Caution coverage decreases below 5 GHz, it may need a repeater to be built between them.