I don't know what's up either, but the data speeds for the past ~4-6 months have been getting worse and worse. I started noticing it a couple months ago when streaming my music started taking forever (or just didn't work at all). I'm in the Chicagoland area (western suburbs). I am rooted as well, but I can't see why that would have anything to do with the network. I can't put up with this anymore since I depend on mobile data (I work out of my car mostly), so I'll be out the door as soon as my contract is up.
If you're seeing slow speeds in only one area (perhaps from a single tower), then it might be worth calling it in. As for me, my speeds are just terrible all over the suburbs, and I wonder what other people think who live in the same area as me.