I've recently installed OS X 10.10 on an external SSD (120GB, PNY) in an USB3.0 enclosure. Everything is working great and the whole thing (iMac late 2013) works really fast now. BUT: when I put the Mac to sleep, is does never wake up. It looks like it cannot find the SSD anymore after sleep, and therefore it hangs. Any suggestions on how to fix this? Should i buy another enclosure, or is there a problem with the SSD? Or is it just a bug in OS X 10.10? Thanks in advance!