Buttons sticking is a real problem, I don't know what to say about that, I would think Sprint would have to fix that for you. I haven't noticed and problems with my battery back, want a flimsy battery back look at the Mogul now that's a flimsy cover. I was actually very impressed with the build quality of my Touch, after 3 PPC's with sliding keyboards "my touch feels light and very solid"
no pun intended. Have you compared yours to any others? It might be worth a stop at a local Sprint store to compare maybe your just getting some from a bad batch.