[bdurst08]

I haven't bought the seido, which based on my experience w/ my TP2 I didn't like. I had the exact same problem you are.
I did however buy yhe case that they sell at sprint store. I like it a lot actually. It doesnt't add a lot of bulk which I felt the seido did. It snaps on tight and hasn't come off yet in almost 2 weeks. And it also comes with a rear faceing belt clip.

Hope this help..