Hi, My Retina Macbook Pro 13" suddenly freezes upon restart or reboot. I first noticed it a couple of days ago. Normally, I only reboot my rMBP when updating or carrying my backpack. Upon reboot, it takes much much longer than usual (normal: 5 seconds, now: 2 minutes) until the Apple logo appears. It takes another 2 minutes getting to the login screen, where the touchpad cursor and the keyboard are extremely sluggish (1 keystroke takes 20 seconds to appear). I have Filevault enabled, so I'm unable to login at this point because the rMBP is so slow. I already tried SMC reset, PRAM reset, starting in Safe Mode and Apple Diagnostics, which also take much longer than usual. Once, AD threw an error (VDC001 which means SD card reader failure), but every time I try it now it exits without errors. What fixes my startup freezes for now is leaving the rMBP off for about 2 minutes having the power cable disconnected. The Apple Service told me that they can only do something if AD returns an error code. What do you think? Have you experienced similar issues? Could this be an early symptom of logic board failure or some kind of power converter issue? I'm only 3 weeks within warranty now. So, I'm thinking about extending the warranty with Apple Care. However, I'm puzzled and unsure what to do.