Did you tried any kind of workaround already? You should clean your BFBC2 game-data folder under your Games tab of your PS3. Re-install BFBC2 and check if the issue still exist.
This issue could be related to your Media Connection.
The Media Server Connection allows other devices to connect to your PLAYSTATION 3. Often, the Media Server Connection is known to cause issues when players try to connect to the Internet for online game play.
Turn off the Media Service connection can slower your PS3 internet connection (especially for downloading).
Please enable the following online ports on your connection:
TCP: 80, 443, 9988, 10000-10100, 17502, 42127
UDP: 3659, 14000-14016
For specific instructions on how to open your ports, please visit http://www.portforward.com/ or contact your router manufacturer.
Cheers
Basti
