MacBook Pro 15 Mid 2015 does not wake from sleep

I have a base model MacBook Pro 15 inch mid 2015. Occasionally, it doesn't wake from sleep when I open the lid. It shows the black screen with a backlight on. After about 10-20 seconds, the cursor appears, but the system does not respond. Sometimes it wakes up normally after being asleep for a full night and sometimes it cannot wake after only of 1 hour of sleep.

I have tried everything that I could: Resetting PRAM, SMC, reconnecting the battery, reinstalling the OS. I have tried all major versions: 10.10.5, 10.11.6, 10.12.4. All having the same issues. I have even tried installing the OS on an external SSD. Even from there it doesn't wake from sleep. The only thing I've noticed while working from external SSD for about three days is that my internal SSD 2-3 time disconnected by itself and OS was no longer recognising it until I've restarted my Mac. So I unchecked "Put hard disks to sleep when possible" setting and this problem has gone. But I was still unable to wake the Mac from sleep when I opened the lid. Apple Diagnostics does not report any problems.

Based on the behaviour from working on an external SSD, I think at some point, my internal SSD fails, if it's completely idle. My Mac is out of warranty. I want to troubleshoot the problem myself as I doubt that Genius Bar will suggest me anything better then reinstalling the OS.

Any suggestions on further troubleshooting steps? Anybody else having this issue?

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