Hello,
Thank you for reporting the issue.
We need crash dump files from this folder for solve your problem.
C:\Users\<Name>\AppData\Local\Arma 3\
Can you upload somewhere in winrar package please?
When package will be smaller than 5000k, you can attach it here. When package is bigger, please use some free sharing service and post link here.

How to find correct crashdump file:
Try to make the crash happen
Look into crashdump folder
Upload crashdump with latest date in name (crashdump is rpt + bidmp + mdmp file with same name). Please try to provide as many crashdumps as possible, it helps us investigating the problem in a big way.

Thank you.

http://feedback.arma3.com/how-to-user.html

I download a new file for you.
Hoping that it will help ;)

Hello,
my apologies, but I had to delete your attachments. They were corrupted and I could not upnack them. Would it be possible to pack the files again and upload them one more time?
Thank you very much.

I have reupload the file.
If they were corrupted also, thank you for telling me

additional information : I am forced to restart the pc when I'm on a server with crowded because arma do not even want to stop

Update : crash on my server while I never crash over when they do not have too many people.

And other details, If I connected before there was 10-12 people and there are more than 10-12 people (max that are connected to my server 23),I do not crash Hoping that this will help you detail ;)

still no response for 2 months ...