I have an iPhone 6s and I just noticed recently that when I charge my phone and it gets stuck on the percentage for example I just plugged it in like 15 or 20 mins ago it was at 22% when I woke my phone up it just moved up 1% so I restarted my phone and it was at 42%. Should I let it die? I've only let it die once since I got it in December and I've heard it's bad to let it die a lot. Any help would be greatly appreciated. Was wondering if anyone else had this problem