CALL OF DUTY
Please be sure the cable is not bound and the portal is not near any electronic devices or other portals. Additionally, try playing offline (disconnect the console from an Internet connection). You may also want to check the game disc for any scratches, fingerprints or cracks. If any dirt or smudges on the game disc, please clean it with a non-abrasive cloth. Do not use any chemical or water.
Please let us know if the freezing continues while playing offline.
Thanks so much for providing details of what troubleshooting steps you have already taken. You may want to try deleting any blocks that of data that is no longer needed or in use to free up some space. Once this is done, restart the console and see if the freezing still occurs.
If you still experience freezing, you may have to delete the block of data for Skylanders Swap Force as well and restart the console.
Please let me know the results.