My Surface pro 4 is 16 months old and has worked very well up until this point. A couple weeks ago, it shut off when I unplugged it from the charging cable and now it shuts down every time power cord is removed. The battery life indicator says "Fully Charged 100%". It functions 100% perfectly aside from this issue and is in perfect shape cosmetically as I am very careful with it. I took the device into my local microsoft store. They ran diagnostics on it and told me the battery was at 92% of it's original capacity and fully charged, after that they installed all of the latest software updates. Finally, they said they did not know whether it was a hardware or software issue and that they had seen similar problems but the device had always indicated a battery error, or the battery refused to charge. The staff were very courteous and apologetic and told me it was a device failure and not my fault, but that it was un-serviceable. They then offered to sell me a new device at full cost minus my 10% student discount. So I wanted to see if anyone has had this issue and could offer a possible solution. I love the SP4 but I definitely wasn't planning on dropping another $1k on a new one 16months after my original investment. It seems like there should be some way to fix it or at least a better explanation as to what caused the issue.