Once there is a problem and then they fix the issue they end up hundreds of thousands maybe even millions of transactions behind which is now a new problem; cat

Once there is a problem and then they fix the issue they end up hundreds of thousands maybe even millions of transactions behind which is now a new problem; catch up the old transactions until the system is entirely caught up or process new transactions and old transactions so at least some of the customers will be happy and the unhappy ones, well they were already unhappy anyway. This is hard to compare to Apple, other then they seem to have kept the iTunes service online without interruption. I would be really unhappy if Apple iTunes service went down right when I bought a bunch of my favorite Britney Spears songs.