Hello all. I have a curious problem with my MBA. When powered on I will close the lid to put it to sleep. After a while I come back and open the lid to start doing tasks again. I enter my password, do a few things and the thing falls back asleep. I have to move the mouse a few times to wake it back up. Has anyone else had this problem? My MBA is a 2012 model with Core i7, 8GB RAM, and a 256GB SSD. Thanks.