They're not alone
Verisign has had issues as well (specifically last Christmas season), so I don't think any payment processor is totally immune. If those 2 can have outages, anyone can.
As for a second data center, that'd be tough. Since they need a transactional database, a second datacenter would have to be connected to the same database server, which just doesn't work all that well. I've got some friends at First Data (FDR) and have seen just how much of a mess that can become in a hurry. A secondary connection should take over in a situation like this, but that's probably the unexplained part they mentioned since they said primary ISP.
Just my 2 cents.
Brian.
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