jkOnTheRun notes that lots of people are experiencing data connection problems with T-Mobile and theorizes that the possible reason is that T-Mobile has finally gotten wise to the "T-Zones Loophole", which allows you to get access to the full internet while only paying for the supposedly WAP-ony T-Zones service. A photo of an internal T-Mobile document backs this up.
It's intermittent (I haven't experienced it yet) and not limited to T-Zones users. Have you had any hassles lately with data plans?
Some folks are offering the theory that T-Mobile finally caught on to users who have been using the web services by exploiting a hole in T-Mobile’s setup and that the carrier has blocked all the various ports to shut that down. That is backed up by this internal T-Mobile Customer Service screen (posted on Howard Forums) to help reps deal with calls about this issue:

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I was hit by the data outage. My phone stopped receiving all data last Friday. Yesterday, the data connection started working again. I don't know if it's being shut down or not, I'm just happy it's working for now.
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