I have had the following happen a couple times and it is really frustrating. While on a call, say with a credit card company, I will be prompted to enter a my account number. I pull the phone away and look at the screen, which is on. I then touch the dialpad symbol and the numbers come up (like when making a call). I dial a number, the phone screen goes off, then comes on and goes off. It is making it impossible to input numbers. Has anyone experienced this or tell me why the screen is not staying lit.