windows 10 Sleep mode & Boot Issue

[yadnexsh]

Hey ,

I was working on pc , some gfx work and then I left my work station so i thought I should my pc on sleep mode to retrieve the work from ram , bcz my work wasn't final so i thought instead of save , sleep will be a good choice

Then i came back, around 15min

Then my PC wasn't responding / booting idk what was going on then i thought to hold the Button to shut it off like force shut still not working then i thought to go for reboot still same then finally i thought lets switch off the button (PSU Button , not main swtich) then my PC wasn't responding then I turned of main switch waited 1min then still same thing 

Twists - after so many tries I turned on pc but i got my data back but wait howww , I turned off the main switch so it should kill the data also right ?

Mistake - After that I tried same sleep and same thing happened pc wasn't responding

Then Somehow again i got the boot and I tried Pc restarting and all it was working atm now , but let's see tomorrow at morning

The Que - why this thing was happening , is it win10's issue but , I turned off the main switch so it should work right ?

2.Happned same thing on 2nd sleep mode

3. Is there any psu issue any chances or voltage issue ( I am getting L & N rev when i connect my monitor to board so idk what's the thing)

So , I am worried now psu issue or home voltage issue idk i m damn worried rn

Specs - 7 3700x / msi 2070super / msi x570gaming edge wifi / 16gb 3200mhz / Corsair 750w / win10 (not activated) 

 

Any test that should i do ?

Ps - waiting for electrical eng tmrw to check volts and all