update to this thread: Brian Armstrong: You're right, we have a lot of work to do to optimize coin selection.
If this was just one wallet and they took care of the problem in other wallets, he would have said so!! His tweets makes it clear this is an ongoing problem.
Leave Coinbase while you still can, don't say no warned you. Mt. Gox had many warning signs too, those who didn't listen still regret it to this day.