Easy way to fix bad quality issues..... Call Tmo and tell them your 5 button doesnt work. They will have you reset, remove battery, blah blah blah, but in the end, they will send you a nice clean new phone. Backup yours, restore the new one, and presto....

My advice... do this often as usually it will reset the warranty Dont tell anyone I told you

If you try to tell them its bad quality or the connection is bad youll get sent to tech support and thats a HUGE hassle.. the 5 button is a surefire replacement