I'm using a mid-2012 MacBook Pro (2.9GHz i7, 16GB RAM) and am using a 256GB Samsung 840 Pro SSD. I've been using this setup for the past 5 years without any issues. Recently, when I went to turn on my MacBook Pro, I was having issues booting. It would boot and show a flashing folder or flashing X with a circle around it. I assumed my drive could be corrupt, so I formatted the drive in internet recovery (regular recovery would not boot), and tried to re-install macOS. I was able to successfully erase/format the drive, and when I ran First Aid, everything came up as okay. After several attempts, I managed to install macOS. Then after a couple hours, I get the same error when booting. I decide to give my laptop a break. As I was looking online, I noticed the hard drive cable is a common problem, so I ordered one and replaced the one in my MacBook Pro. I also insulated the cable with electrical tape as I saw many users recommended that as it increases the life of the cable. So now I format the drive to APFS, re-install High Sierra, and things are working okay. I enable TRIM as well and I setup bootcamp so I could use the Samsung Magician software (only compatible with Windows) to update the firmware on the SSD thinking that could be one of the issues. I have a software on my Mac called DriveDX and it's showing the "CRC error count" as 14%. The raw value is 83,347. And both the current and worst are 14. Other than that, it's showing the drive is in good health. When I boot into bootcamp and run the Samsung Magician software, it's showing the drive health as good for everything and not mentioning any errors or areas of concern. I'm confused as to what caused the initial problem of my computer not booting, and why I couldn't even install macOS. I'm wondering if this CRC error count had anything to do with it. I tried another SSD in my MacBook and I don't get any CRC errors in that DriveDX software. My MacBook with the SSD at 14% CRC is now working perfectly fine. The benchmarks are great for it as well. But I am not sure what I should do, just keep using it as it is, or replace the SSD. Do you think this warning means the SSD is going to die soon? Thanks for your time and sorry for the long post.