Hello , i have a MBA 2012 11'' ... i don't know what has happened but the last month i have noticed that the battery drains when i but the MBA on sleep mode ( you know just close the screen). for example yesterday i closed it at 12 at night and today at 9 the battery from 100% was 95% ... that was not happening before ... if it was 100% it remained 100% ... do you know if any of the updates made that or if it is something from the settings?