Games Crash and Shown as ''not Responding'' in TaskManager

[Ranger07]

Lately my PC has became very annoying, almost everytime i play any game on it, it crashes (but i can access task manager and can force shut the game to remove it from the screen). IT OFTEN CRASHES WITHOUT ANY ERROR while RARELY it gives me errors like "DGI_ERROR_DEVICE_REMOVED The video card has been removed or driver updates has occurred......." and " DGI_ERROR_DEVICE_HUNG The application's device failed due to badly formed commands sent by the application....." . I found these errors pretty common online and came to know about the fix people use which is "TdrLevel" key in registry and setting its value to zero, i tried it too and was happy that it would solve my problem but it didn't, instead with this fix my PC would crash instead of the game (cant access task-manager or anything else and pc stucks completely).
Tried the driver fix and Reinstalled my windows too but no luck 
Games i play;
witchers 3, Apex Legend(mostly), NFS payback, PUBG and few more
I monitor the temps and load too, nothing abnormal with them.
someday it works fine but other day it wont even let me drop into the map on Apex legend.
one thing more, i can even hear the sound when it freezes, seems like the game is running but display is stucked.

Specs:
i5 6600 cpu
MSI Armor gtx 1070 gpu
corsair vengeance 8gb 2400mhz ram
Asus z170k mobo
Corsair Tx650m psu ( just bought )
120gb ssd for windows and 1+2tb hdds for games and stuff

No overclock, everythings at stock