Sorry but I must say this. Ea technical support seems to be stupid, they they aren't reading my but they are answering. I wrote them (2 times) that clear cache and delete save games isn't work. It is their next reply:
Hello Daniel,
Thank you for contacting Electronic Arts again.
I appreciate your interest in Mass Effect 3 and assure you that I will try my best to resolve this crashing issue. You need to clear cache and delete save game files. For your convenience, I am providing you the steps.
XBOX Clear Cache:
Let’s first try to clear your console cache, this can sometimes cause issues with game. To remove these files, follow the steps mentioned at the below given link:
http://support.microsoft.com/kb/971755
Delete game save files Xbox 360
Corrupted game files can sometimes cause a faulty online connection. To remove these files, follow the steps below: 1. Start your console with the game disc out so it launches into the Xbox Dashboard.
2. Select the System blade.
3. Select Memory and press the A button.
4. Select Games and press the A button.
5. Select your game and press the A button.
6. Delete all files for the game.
7. After following these steps re-launch the game and try to go online.
Note: deleting your game save file would reset your offline game progress and you would need to play the game from start.
In case of any further questions, please feel free to get in touch with us anytime. Alternatively, please visit us at www.help.ea.com.
Regards,
Rubul
Electronic Arts - World Wide Customer Experience
I cannot believe that EA is paying them for it...