Every now and then when I turn my iPhone 5S on, it will display the Low Battery icon with the "Connect to power" instruction. Now, this is strange, as when I turned it off, it had plenty of battery life showing. So, I plug it in to the charger, it powers up, the normal screen appears, and then within a few seconds it's showing the battery life that was displayed before it was switched off. Disconnect from the charger and it carries on as normal. Coconut Battery shows it as 90% of original capacity. Has anyone else had this?