I have recently bought a MacBook Pro 15". A couple of days ago I had charged my MacBook and left the charger to the socket and it died. When I tried running diagnostics, it showed that power adapter has to be plugged in.
There was no sign of power fluctuations, no signs of burning or bulging on the adapter. There were 2 other PC adapter which were left in the same state but nothing went wrong with them.
The Apple Store initiated a replace of adapter. I would like to know if there is something wrong I have done by leaving it on the socket, because I do it all the time with my PC adapters. I'm new to Apple Macs.