This didn't happen before so it's new. Every time the iPhone is out of battery and I plug it, it doesn't show up on screen that it is charging and keeps repeating the plunging sound. And it won't turn up if I let it still plugged and it heats so I leave it without charge for 2-5 days then when I check if the screen works before charging and displays no battery icon I will charge and it will return charging normally and opens. Do you think this has to do with the battery? or some bugs in the iOS? Please help me.