Continually aborts the connection

The INSTAR 3010 is powered by Wi-Fi and a AVM 7390. Have you since early April 2011th
Have you ordered with wide angle. The image is relatively good. It overlooks an entire living room. The night vision is fine. For its purpose to monitor a dementia care and needy person, it has everything you need. Only one thing is not, it is very unreliable. And thus a threat. It comes almost daily sporadic abortions or spontaneous boat operations. The minutes of the Fritz box that looks like this: You can see here how the camera several times put on and logs off within a short period, or fails during the registration.

Logged 24.06.11 00:49:13 WLAN device (2.4 GHz). Name: Webcam, IP address: 192.168.178.22
24/06/11 00:49:03 WLAN registration failed (2.4GHz): Authorization failed. Name: Webcam
Logged 24.06.11 00:39:13 WLAN device (2.4 GHz). Name: Webcam, IP address: 192.168.178.22,
24/06/11 00:39:03 WLAN registration failed (2.4GHz): Authorization failed. Name: Webcam,
Logged 24.06.11 00:29:13 WLAN device (2.4 GHz). Name: Webcam, IP address: 192.168.178.22,
24/06/11 00:29:03 WLAN registration failed (2.4GHz): Authorization failed. Name: Webcam,
Logged 24.06.11 00:23:51 WLAN device (2.4 GHz). Name: Webcam, IP address: 192.168.178.22,
24/06/11 00:23:45 WLAN device deregistered (2.4 GHz). Name: Webcam,
Logged 24.06.11 00:23:35 WLAN device (2.4 GHz). Name: Webcam, IP address: 192.168.178.22,
24/06/11 00:19:10 WLAN registration failed (2.4GHz): Authorization failed. Name: Webcam,
24/06/11 00:19:03 WLAN registration failed (2.4GHz): Authorization failed. Name: Webcam,

Abruptly, the camera logs off, and then attempt to log on. That would be a mere necessary evil.
But the camera moves the lens after booting in a central position (can not be deselected, despite park) The overall view is lost and must be corrected on the menu. Worse are the terminations without previous cancellation. Because in this case, the camera can be addressed again when the power supply was interrupted briefly. Then she passes her again a boot. This is particularly annoying when I'm not at home and want to control of Away on Internet. Only black screen.