hello everyone, I have a MacBook Pro mid 2015 a1398 15"inch with 512gb ssd. I bought the Samsung 970PRO 1TB with sintech adapter, I did installed everything properly inside the computer itself and the MacOS Mojave VERSION: 10.14.5 - and I have a some problems with that. -sleep mode - I'm trying to sleep my computer and it sometimes ok and sometimes the computer crash. -startup - when I'm turning on my MacBook Pro it most of the time show me "flashing folder with questions mark", and sometimes its turn on regular. -restart - when im restart the computer it sometimes show me the flashing folder and sometimes its works fine. I have tried to do some tutorials that explain how to write some different codes in terminal, it fixed it for 1 hour. but I think when in turn my computer off it restarting everything, and all the code is reseting. please HELP ME!!