Ingenious device with weaknesses

I've been trying for ages to AVM to upgrade as they build quite cool devices .. but that's is now the third Fritz! Box, which I return. 7270, 3270 and now the top model, here in 7390 was my only problem most Wi-Fi, which 84.04.86 and several different configurations (even if one excludes any sources of interference in the wireless frequencies) was not running properly stable despite the latest firmware.
Since I have not yet received an answer from AVM and have many others with the same problem, which is 100% at the Fritz box also, and my internet is really important that box for me is just so in the state not a real device for continuous use (among other things because even VPN). If you use only Wi-Fi devices and wireless computer can garkeine reconnect, can not do anything sensible with the VPN and rely on it, that you walk in their own network so.

The WLAN problem looks like this:
- In certain irregular intervals (5 until 7 days OLaufzeit) can connect to a single wireless device more with the box via WLAN. The only "permanent" (again for few days rest) is the FritzBox reboot when the WiFi briefly deactivated and then activated the WLAN when it is running normally, but usually for a few hours.

Otherwise, the device is a dream, clear configuration interface with many settings, looks chic and is super fast.

Those who can not do without WiFi, I would advise against the unit at the moment.