Hi, I recently had my MacBook Air 13" mid 2013 screen and possibly graphic card break and since it's my work laptop, I needed a quick replacement. Apple support was more than 5 days wait time, so to save a few bucks and still get up running fast and after doing a lot of research I made a quick decision to buy a 'new' MacBook Air 13" early 2015 with 128GB SSD and replace it with my old 512GB SSD. Install went fine and everything booted up, but since then I'm experiencing the laptop often freezes after going into sleep, eg. closing the laptop, or timing out, or today I got a black 'Panic' screen. Only way to recover is to push power button to shut down and reboot, which means all the stuff I've being working on, emails etc. is gone. Anyone had this experience and would know if it relates to incompatibility between the old 2013 512GB SSD and the 2015 new 128 GB SSD?