Thank you everyone for your answers. I will answer in order.
About Client extension: I have returned to the area (many VFX together) without the client extension. Result: Instant restart of PC.
About V-Sync: I have it activated as I read long ago it helps modern hardware to work better on this game. Without it, it also happens.
Sound crash issues: I created an area similar to that in which I was crashing constantly. It had no sounds. Result: The PC restarted too.
The link to " Just Had The Weirdest NWN2 Toolset Issue (A Solution)": The area was sized 8x8. Result: The PC restarted aswell.
lord_XD question: “when do you ger this problem?” Everytime I enter in certain areas in which there are many hungry visual effects (such as two or three fogs together) or many shadow playing (when you place a light inside a thayan lamp, it looks amazing but restarts my pc).
Use client extension. Result: It restarts too.
Video drivers update: They are always updated through GeForce Experience.
Sound drivers: Where are them?
" NWN2-- constant crashing during combat, page 1 - Forum - GOG.com": I have reduced my sound quality to minimum. Result: It restarted too.
" Crash issue :: Neverwinter Nights 2: Platinum General Discussions ": They reduced resolution. Result: I changed to the next lower resolution. It took longer to restart, a few seconds more, but it restarted once I moved on fullscreen.
" NWN2 - Crash after starting new campaign or loading saved game, page 1 - Forum…": In this case they erased override folder from game directory. REsult: It restarts too.
UP TO THIS POINT: I might be paranoid, but I always listen a sort of electric buzz when it restarts, could it be the power supply malfunctioning when the graphic card demands more power? If that is the case, why does not it happen with other games in 4k?
" (Solved)Game crashing constantly after 5-10 minutes :: Neverwinter Nights:…": Change NWNplayer.ini information an compatibility mode. I choose Windowds XP SP3. Result: The client extension does not work in compatibility mode. The PC crashed despite the nwnplayer.ini modification.
" Do ur game crash? :: Neverwinter Nights 2: Platinum General Discussions ". I already use game extension.
" NWN2 Win 10 FCU (silent) crash on exit, page 1 - Forum - GOG.com" They are arguing… But, about this topic, I conclude my problem is not a driver base one as it does not happen always, but sometimes in some areas (in this area, always).
" NWN2 Crashes when I hit Windows Home key, page 1 - Forum - GOG.com" The advice is to go back to windows 7 which is not the solution. One of my gamemates has Win 10 home (I have pro) and same graphic card and he plays smoothly without restarts.
" r/neverwinternights - [NWN2]Terrible performance on high end system". The problem is unresolved. Notwithstanding, they suggest to play with the options of Nvidia Panel for the game. I already did it, because before this, the game was constantly constantly restarting the PC. Now it is only in some areas with water, fog and light.
" tep-by-Step common fixes for NWN Crashing/Freezing/Graphic wierdness". It gives a common 10 tips for fixing problems. I have already tried everything except the specific things for their server and NWN1.
About the soudn problems, as I said, the area which I am using for testing has been deprived of any sound effect, music and ambient sound. It has only graphic special effects on it and water, and it is an interior. I have nothing installed related to Nero or Cyberlink.
The last part, "maybe help(find in google_
(Error-checking & defragging your HDDs.
Using the original executables.
Disabling any & all mods.
Post for help on the Bio BB.)
Try disabling EAX (environmental sounds) before transitioning areas. That cut the incidence down from crashing 2 out of 3 times to more like 1 out of 10 or 20, which was much more manageable.
describe your problem and search in Google and on YouTube
Google : NWN2-- constant crashing during combat
and most often users encountered this problem and
it has already been decided.
Good luck with your search."
I have searched through Google and Youtube extensively. I have found no one with this problem. Just a guy whose brother had the same PC-build he had and just one of them had the problem.
I will buy a new power supply unit this week and I will try, just in case this could be the problem. Notwithstanding, I run the test a week ago and nothing went wrong.
Thank you everyone, I will keep you informed!