When I'm in a call and need to use the keypad I pull it away from my face and hit a number and bam... screen is blank again. That is, if I even have enough time to hit a number. Sometimes it will come up and immediately go back away before I even have enough time to hit a single number. Does anyone know of a way to lock it to a minimum specific time, like A SECOND? This is a very frustrating issue. Disclaimer: I did several searches for this and did not find a similar issue.