there is an issue with my iphone. after i got back from a long car trip i tried to plug in my phone to my charger, and it didn't pickup the charge. Sometimes this happens, so i usually just flip the charger cable over or whatever and put it back in a few times or whatever and it seems to work just fine. But now, it's stopped working and i don't know why. it will stay at 1% for 10-15 minutes, and then die. When it dies, it charges up and powers on just as it should. When the phone is actually on, however, it will start at 4% for about 5 seconds, then go down to 3% for 1 minute, 2% for 5 minutes, and 1% for about 10 minutes. It's been doing this for the past 2 hours now. It's obviously not the charger or the charging cable, so it's an issue with the phone. What would it be?