Just to follow up on my previous post; the most frustrating thing is that customer service at SDS doesn't help out at all. You'll likely receive a generic response from a rep named Miguel, asking you to change some ports when this is NOT an internet issue! I've had the problem over a month now, I know some players have had it more than two months... but more and more people are starting to experience it. I suspect it's some form of glitch with certain MLB accounts that's locking us out from the servers entirely. Either way; your best bet is to go through PSN Support and hopefully enough of us can report the issue that they turn their attention towards it.
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