I am having a problem during phone calls to automated services. These calls ask for information to be keyed after prompts. Often during these calls the screen will go blank. I press the power button to turn on the screen - it does for a second then goes blank - repeat -repeat screen will not stay on, automated system times out. VZ support says it must be a third party APP which is conflicting with the phone and I should delete the apps to resolve problem. What is the purpose of thois sophisticated phone if I can't use third party apps if I actually want to use the phone function? Anbody have this problem? screen setting is 2 minutes.