Agree, also can try to customize the APN provided by Telenor if the APN from German provider can't do the thing.

Is your D2 running the latest firmware? Your case is too odd. I suppose it should be some compatible issue.

Actually your bandwidth is not very good, only 2Mbps. That may be one of the factors. Will the problem happen to all your devices? How about the situation when the PC wired to the modem? You may...

Is your computer in the High Priority list? Does this issue happen on all your devices? How about the device connected wired to the modem? You may reset the modem and reconfigure it to have a try. A...

Did you change password and IP according to your own case?

I didn't find any software for my mac as well, but I found two url for video streaming rtsp://admin:Password@IP/h264_hd.sdp rtsp://admin:Password@IP/h264_vga.sdp