SHould I get a new phone?

[Singer_Actor]

Okay, Iv had it for a week. Alltel.
Well, my keyboard lagged, so I used a .cab file. It worked, but when my keyboard started to stop working I uninstalled it. It worked again. But then went out several times. So I used a reg edit, and same thing. So I hard reset. Now It goes out occasionally (takes anywhere from 1-10 resets to work) and it lags. And it either skips my space bar,(likethis is how itwould typethis sentance) or puts 15 spaces in. Sometimes one button will repeat to. Like this for exxxxxxxxxxxxxxxxxxxxxxxxxxammpleeee. (and I would only type example).

Now the lag is INCREDIBLY Irritating, but I think it messed with my keyboard. Can a .cab file do this? or is it just the phone?
It started doing this after only a few days of use. My keyboard is also essential to me. I rack up about 15,000 txt messages per month (incoming+outgoing) So a working, non laggy keyboard is an essential part of my phone.

Also, my music player even crapped out on me on TF3D so Im using Nitrogen Music player. Help anyone??