I think the drop to desktop is server issues.
Make sure you connect to the right server version. Not all of the servers have installed the 1.1 patch.
I know what ya mean about the stuttery stuff. Trying to take off from the AC when it's jumping about is a nightmare.
Top game tho.. With a few glitches ironed out, the full game will be awesome. Loads more vehicles, subs, more planes.. Top stuff indeed!