This has happened twice:
I purchase Miami Heat packs until I obtain Ray Allen. I add signature skills to him, use him for a few games, and then attempt to add contracts so I can keep using him in MyTeam games. Out of nowhere, I am unable to add any more contracts. Also, his signature skills disappear! I have at least $20.00 invested into this Ray Allen mess, probably more (because he's my favorite player). 2K credited me the first time it happened with 30000 points after sending them multiple screen shots. The 2nd time it happened, no response.