Just like Ubisoft's Assassin's Creed II, the latest Command & Conquer game from EA uses a DRM scheme that requires a continuous Internet connection. When ACII was launched, a small percentage of gamers were unable to enjoy their game due to a DDoS attack, and now Command & Conquer 4 players are causing quite a stir on EA's message boards. Players complain about crashes, connection drops and lost progress due to the new DRM.
Considering that C&C4 is all about player progression by unlocking new units through experience and the like - this is very bad indeed. I have experienced some of the troubles myself, such as moving the cursor 'too soon' after the game menu appears - crash.
It's been advised that should you lose an Internet connection during the singleplayer campaign, immediately save and then quit to reload the game. Oddly C&C4 doesn't try to reconnect once it warns of you Internet loss.