Although we were all quick to blame Sony’s PSN servers, which can be quite abysmal at times, the real reason for Driveclub’s issues seems to lie at the feet of Evolution Studios, with the game’s director confirming that the issues are down to their server code having bugs.
@KrisTheKritik We've got no limits to the amount of servers or the quality of hardware, its purely down to the server code having some bugs.
— Paul Rustchynsky (@Rushy33) October 12, 2014
There should hopefully be a fix soon, with a new post on the Driveclub Facebook page stating that a new update is imminent:
Over the next 24 hours we are rolling out a new game update alongside server upgrades that will help to improve server performance, clubs and multiplayer functionality.
If you have been playing online, be aware that they are running diagnostic tests so your playtime may be intermittently interrupted. Let’s hope, for the sake of everyone, that Evolution get their heads around the issues soon, and we see that PS+ edition finally release.