I upgraded the drive on my A1708 from a 1TB to a 2 TB SSD I bought off of ebay. After 2 weeks of use, when starting the computer it will no longer find the drive. It gives me the question mark folder. If I try to search for the drive it does not even show up, HOWEVER when I start the computer and reset my NVRAM it boots up fine. I have to do this every-time for it to boot up properly.
Is the new SSD drive bad? I never had any issues with start up with my OEM Apple drive.