As Adam said, just contact TD so they can help sort out your problem.
I have been running the 210 for just over a year and have never had a driveshaft come out. I always run maximum droop at the rear too.
As far as the ball cups, ive also not had a problem since the materials were changed. I run kit TD ones always, with absolutely no issues.
Some silly comments here people, TD are always listening to customers feedback and looking for ways to improve their products. Their cars are are probably the most robust and easy to work on in the market.
If you have a problem with a product, you go back to the shop you bought it from or contact the manufacturer direct. The RC industry is no different.
Send them an email or give them a call, simples!
Craig