I have a new 4S that is about a month old. I have downloaded only 2 apps both shortly after purchase. I have also gotten some music and ringtones but not recently. Within the last few day and specifically within the last 24 hours, the phone has shut itself off and refused to restart. The last time I did a soft reset to get the phone to turn back on. On both of the previous occasions when the phone turned itself back on the battery was almost completely drained. I am at software version 5.1.1. The last time I just had a text message from a non-iPhone phone then received a call but it locked and then shut down not allowing me to answer the call. Has anyone else run into this and found a fix?