I've got the very same issue. I'm usually not someone who keeps his laptop on his desk. I like to keep it on my lap (like the name suggests) or in my bed. That was no problem with the old magsafe (albeit it was very shortlived). With the new one this can get very annoying. The real problem is that the plug is designed in a way that it reacts very differently to forces depending on their direction. If you pull on the cable in the direction orthogonally from the edge of the macbook, it's quite strong, you can even drag your macbook around like that. However, even the slightest pull downwards or upwards will unplug it. It's extremely annoying, because often the cable weight is enough to unplug it, there's really zero strength at all in that direction. The longish plug acts like a lever and I'm not sure who the hell thought that was a good idea. It's simply a failed design and it angers me that Apple is going back and forth with this, even though they figured the best solution out with the L-type magsafe. It just makes no sense to me.