Every time i load the save-file the game crashes after about  15 minutes an 25 seconds (i measured it with a stopwatch).

I tested to make no input with the mouse or keyboard after 15 minutes. Same result: "The program stopped working" message from windows.

I play with the Steam version on Windows 10.

In the options i turn off the music an set the game to full screen. I have to redo this changes in the options after every start.

What can i do to figure out the reason for the crash?

Wow that is really weird, even with no input it crashes at 15 minutes.

After some googling I found links with what sounds like a similar thing for other games, and the problems seems to be a process called tabtip32.exe. Can you try killing it if you see it in task manager and follow these steps to disable it:

 1) Open Task Manager

2) Go to Services

3) Identify TabletInputService (Touch Keyboard and Handwriting Panel Service)

4) Stop the service

Links:

https://steamcommunity.com/app/72850/discussions/0/490125737464717517/?ctp=2

http://www.neogaf.com/forum/showthread.php?t=1148961

Also the turn off music and full screen will be saved if you exit the game properly (without crashing). So change those settings and then quit, and it will be saved for next time.

Thank You very much for your fast response. Sadly I have to disappoint You:

I tried to deactivate the Touch Keyboard and Handwriting Panel Service in the Task-Manager. Because of the setting of its start type (automatic) the service restarted immediately after I stopped it. So I set the start type to deactivated. After a reboot the service was deactivated.

This workaround didn't solve my problem. The game crashed again after about 15 minutes. 

Then I updated my drivers (the GPU driver wasn't up to date). Stil the same problem.

There is an option in Windows 10 to let the system automatically select a tablet-mode. I changed the option to use desktop-mode only. Still the cashing problem...

My last hope was to start the game in compatibility mode Windows 7 and as Administrator. Still crashing after about 15 minutes. 

I'll try to play the game on my laptop now.

Please let me know if You need any more information or if You found a solution.

BTW, my rig:

Windows 10 home 64-bit

GeForce GTX 970 (driver 388.71)

Intel Core i5-6500

8 Gb RAM

Two monitors (one for playing, one for YouTube while playing)

Creative Sound Blaster Z

Thanks for all the additional details. When it stops working and you get the "this program has stopped working" message, is there a "View Problem Details" below like this:

If so can you click on the little arrow and copy/paste the problem details here?

Also what version of the game are you playing? Did you have any trouble with previous versions, or is this the first version you've played?

I'm playing the version 2.21. It is the first version I'm playing. I didn't try earlier versions.

So, this is how the message looks like:

followed by this:

No notification from Windows after I closed the program.

And here some information from the Event Viewer:

The Event Viewer information in text form for copy and paste:

---------------------------------------------------------------------------------------------------------------------

Faulting application name: ThisGrandLife.exe, version: 0.0.0.0, time stamp: 0x6372616f
Faulting module name: ntdll.dll, version: 10.0.16299.64, time stamp: 0xac8afc81
Exception code: 0xc0000005
Fault offset: 0x0005d0bc
Faulting process ID: 0x33ac
Faulting application start time: 0x01d3818dda15369c
Faulting application path: D:\SteamLibrary\steamapps\common\This Grand Life\ThisGrandLife.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report ID: f1e27de0-411b-454a-8b3f-3bc6af6479d6
Faulting package full name: 
Faulting package-relative application ID: 

---------------------------------------------------------------------------------------------------------------------

This is from the "Details" Tab in the Event Viewer:

---------------------------------------------------------------------------------------------------------------------

ThisGrandLife.exe 
0.0.0.0 
 6372616f 
 ntdll.dll 
 10.0.16299.64 
 ac8afc81 
 c0000005 
 0005d0bc 
 33ac 
 01d3818dda15369c 
 D:\SteamLibrary\steamapps\common\This Grand Life\ThisGrandLife.exe 
 C:\WINDOWS\SYSTEM32\ntdll.dll 
 f1e27de0-411b-454a-8b3f-3bc6af6479d6 

---------------------------------------------------------------------------------------------------------------------

SOLVED!

I had the same issue on my Laptop. The only thing my both systems have in common ist the Anti-Virus Software (Bitdefender 2018). You can read more about the solution here: ntdll.dl Crash [Solved (BitDefender Antivirus)]

After I added the game to the whitelist of Bitdefender, I was able to test-play more than 45 minutes without a crash on my Laptop. I'll test it on my gaming system soon.

At First I had problems to start the game on my Windows 7 Laptop. It crashed immediately after I started it.  Under another topic I read about that issue. I loaded an older Version in Steam (that one for older save-files) and that one works. After that I loaded the newest version ( 2.21) again. The game started without a crash. Maybe that experience could help you for debugging. 

I'll report if I experience more crashes.

Thank you for your response an your help. I'm locking forward to play your game in the full release version!

Wow thanks for all the details, and I'm glad you worked out it was Bitdefender! I was looking all over the place for what could cause ntdll.dll to crash but there was so many different things.

And strange that it stops crashing by reverting to the older one and then back to the new one... I did find another problem with the latest patch when running on my super old laptop, so might be reverting some external dlls