Flickering map resulting in game crashing

[depprussell]

Hi,

So, I have a windows 10 HP laptop, 8gb of ram, processor intel(R) Core(TM) i5-6200U, CPU 2.30GHZ 2.40GHZ (i'm presuming it's a dual core), 64 bit operating system.
Alright, I play the game on 1240x720, fullscreen, I start without intro. I'll walk around, and sometimes randomly when I get to a new area of the map, the map starts flickering, the floors and flashing between floors, and invisble, so I can see through the map, and the whole map is doing this, then this causes my game to lag alot, I move away from the area that caused it but it still goes on. And eventually my game crashes. I also got this other one when I walked out of 173's chamber room into the downstairs area, all of a sudden the screen froze, but the walls were stretching and getting thicker, and the screen got smaller and smaller, but I couldn't look around, so I quit the game.
I know this is a great game and I'd love to play it, but sadly this is preventing me from doing so?

Please help.

I didn't find the right solution from the Internet.

References:-
https://undertowgames.com/forum/viewtopic.php?t=5917
Video production studio

Thanks!