This has happened twice now both in mid 20 sounds stopped for zombies and stopped getting drops. Tried to make drop in bank but won't even let u create a power up :/ anyone else had this problem I think it might be a bug! Sort ya **** out treyarch!!!!
This wasn't because of high rounds they just stopped dead then it wouldn't let me even create a money drop in the bank. I've been to round 56 before so I know how the drops get less the higher rounds you get