The game is downloaded from the internet, and I'm running from my internal hd and I've also tested on external hd, and it's in the same.
Is your PS3 in DEX mode? If it is then a possible fix would be to go to your Debug Settings (if you're on Rebug) and change your Release Check Mode to Release Mode
and your Boot Mode to Release Mode
After that, go to Rebug Toolbox make sure your System mode is Rebug and turn Cobra and Webman off Restart your PS3 and hope for the best!
Cyb3r made a tutorial you should also check out Right here I hope one of these things works for you man!!!