For awhile now, there will be times where I'll be listening to music with my iphone with Bluetooth, headphones, or with nothing and it will suddenly crash. What usually happens is when I change the track via the lock screen or control panel. I might skip past two or three songs and then the next song will start to play, but the info on my phone doesn't update then does about 15 second. But usually right after that. My phone will shut down and restart, but I don't see the spinning wheel or anything. Just everything is normal then black screen white apple and it loads up like I just turned it on. Any suggestion would be appreciated. Thanks!