Imaging your iPhone would likely cause the same issue if it's software related. Here is what I was told to do from the Apple Store when I went in: Backup your iPhone either to iTunes or iCloud. Then, restore your iPhone and set up as a new phone. Use it for a few days and see if the problem persists. If so, then Apple should replace it for you. If not, then try restoring your iPhone to the previous backup you did and see if any problems arise. If not, then it should be fine. If the problem comes back *only* when you restore, then there is a problem with something in that backup and you will not be able to use it anymore, unless you want the problem to persist. Best advice I can tell you. Good luck.