Out of no where my phone screen just goes black. I have only had my 4s for a month. It hasnt been dropped and is always kept in the Otterbox Case I purchased with my phone. I dont understand why I have to keep doing this. atleast once per week, sometimes more I am soft resetting my phone. Today was 3 times. Has anybody had a problem like this? Should I be taking my phone into a Verizon Store to have it looked at?