So during my third charge of the iphone 6s plus I've noticed something weird. I started charging at 4% left and got back to my phone ten minutes later... it was still at 4% but after a few moments when I looked a second time it had jumped to 21%... I locked my phone again, got back to it a few minutes later and it suddenly says 13%... Since then one more jump from 13 to 16% and then back to 14%. After that it has been charging normally. I've been googling this problem and have mainly gotten results about people's battery life decreasing by 2 or 3 percent at a time on ios 8 or about the battery being stuck at certain percentages during use... nothing about the above I described. Incidentally I also can go with about 20 minutes of SOT or more before my phone will go down from 100% to 99%, although I'm not sure if this is related with the charging problem.. Anyone having the same problems or know whether this is a software or hardware problem?