Constantly resets itself to its initial state

Positive fall on: The wireless connection is comparatively stable and afloat, thanks to the rotating antennas can also be difficult environments provide good with WLAN.
Set up the device is also very quick.

Negatives:
If for some time (two days, more accurately can the period not limit) no unit online, cancels the UMTS connection. Restoring it can be rectified only by resetting (!) Of the router.
Regularly, the device will then reset after the factory condition and needs to be completely refurbished: UMTS connection, wireless encryption / name, port forwarding etc.
Firmware updates have been around for quite some time no more, so I shall now buy a new router and wander the Netgear device in the basement.