[fuuup]

Or call in. If your phone is crap, then you are entitled to a replacement under the warranty policy.

Tell them you've been to the store several times and that they cant seem to fix the problem. Also express your frustration in a calm manner. They will ship you out a replacement. The only downside is that you might be on the phone with Sprint for a while.

If you handle it the right way, you can also get a replacement through the store. There's no reason that you should be stuck with a phone that craps out on you. By hard resetting and giving it back to you, they are just taking the easy way out. Make them give you a phone.