My old 256GB SSD died, and I've brought a new SSD with 512GB. After installing new SSD and OS, everything works just fine. But now I have this issue with sleep mode: Macbook goes to sleep, it won't wake up. It will start if I hold the start button for a while. I tried to reset the NVRAM and SMC, it didn't resolve anything. I'll be glad to hear any solutions from you, will try everything to get rid of this issue.
Specs: Macbook Pro 15" Retina with Quad-core i7 2.2Ghz, 16GB.