I recently upgraded the stock HDD in my 2012 non-retina MBP to a PNY XLR8 240GB SSD. Noticeable boost in speed, but some sleep/wake problems have followed. If the laptop if sleeping for a while (overnight, several hours), it won't wake up. The screen will stay black for several seconds and then get a soft glow and I eventually have to hard reboot. Sometimes when booting up the screen stays white for several seconds before showing any progress also. Luckily, I'm still within the return window, but I'd like to get something that I know won't have issues. I'm looking at the Samsung Evo 850 drive. Has anyone had issues with this one or is there another that is recommended? Thanks! To note, there does seem to be a firmware update for my PNY drive but with a Windows only installer.