FIFA 13 Problem (season online mode) HELP!

Posted 29th Oct 2012
Suddenly started getting an error when trying to play a season game online. It was fine at first but now keep getting this error.

"we have detected your squad file does not match that of your opponent, and have cancelled the match to prevent unfair play. Should your squad be corrupt or tampered with, you will need to delete your online squad and re-download"

Also I noticed when choosing a team for online season, some of the teams are missing players!? and Xbox freezes up.

Anyone had this or know a fix? I searched net but no answers.
Thanks in advance
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