I just recently bought a 1 TB SSD from Aura for my Retina Early 2015 Macbook Pro. I'm running both Windows 10 and El Capitan via bootcamp. The problem is that sometimes when I turn off my Macbook and leave it off for hours, then turn it back on again, I get the flashing question mark folder. I'm able to get back into the Macbook OS by pressing option at startup and select the desired OS, however, I want the initial boot-up to start with the Macbook OS. The weird thing is that this problem only occurs if I turn on the Macbook after being off for a long period of time. Any ideas on how to solve this problem? Thanks!