Windows7 - BSOD : 0x00000116 nvlddmkm.sys

Hello,
I get strange BSOD-errors with 0x00000116 & nvlddmkm.sys on my laptop.
(Win7Ultimate, i7-4810MQ, 16 GB RAM, GTX 860m & Intel HD4600)

Nvidia & Intel GPU drivers are up-to-date.

The BSOD usually happens when I try to start a game.
Often it also happens when I simply open the browser or start another tool (discord, VLC etc. - it doesn't matter)

It is always the same:
The game or tool will not start, then the system will have some kind of lag & a few seconds later the BSOD will happen.

I downloaded BluescreenViewer & saved the data:

Dump File : 032120-16723-01.dmp
Crash Time : 21.03.2020 00:15:25
Bug Check String :
Bug Check Code : 0x00000116
Parameter 1 : fffffa80`070d00e0
Parameter 2 : fffff880`0fd17944
Parameter 3 : ffffffff`c000009a
Parameter 4 : 00000000`00000004
Caused By Driver : dxgkrnl.sys
Caused By Address : dxgkrnl.sys+5d3f0
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+93ea0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\032120-16723-01.dmp
Processors Count : 8
Major Version : 15
Minor Version : 7601
Dump File Size : 602.808
Dump File Time : 21.03.2020 00:17:07
==================================================

Strange thing is:
The log does not even mention nvlddmkm.sys?!

Hope someone can help me.
Thanks.