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 have already uploaded here on this site under attached files,ill make another upload with latest crash report. I also noticed thah after the game crashes and stops working and closes it isnt closed completly , why am i saying that , well after around 20 seconds my screen blinks like something else just got closed , i cant take a screenshot of that becouse it happens in split second. I dont see any other explanation becouse that happens only after i try to access mulitplayer and the game crashes. Hope this helps , ill provide more info if needed.

Hello,
thank you for the quick answer. You uploaded only rpt files. Unfortunately, we cannot use them for analysis, unless we have complete crashdumps.
(crashdump is rpt + bidmp + mdmp file with same name)

Would it be possible to upload these as well?
Thank you very much!

I see that i missed something , but this is all i can find in that map , there is nothing else inside. I looked at your wiki to see if i am missing something, and it says i quote "Arma 3

The arma3.rpt, arma3.bidmp and arma3.mdmp files are located in your -profiles root directory, or if used without this parameter then it can be found in these default locations:
WINDOWS VISTA / 7 / 8:
%userprofile%\AppData\Local\Arma 3" , but i cant find it there.

That would indicate that your game is not actually crashing (may be force shut down) or the crashdumps have not enough time/space to create. Could you please answer these questions?

1. When crashing, do you get Winows message "Arma3 has stopped working"?
2. Do you have enough space left on you System drive?
3. When crashing, would it be possible to wait about five minutes so the crashdumps have time to create?

Thank you very much.

1. Yes i got the message after i pressed alt+tab. ( it was probably in the background, becouse i was waiting for 5 minutes)
2. I believe i so , i have over 100 gigabytes free on both disks.
3. Like i said at First one i tried waiting, but i will do it again and see what happens.And if i get them ill upload.

Just for info, when that happens music in background stops and i cant move my coursor.

I have good news, game managed to run this time after around 7 minutes. I still got same file as before in that crash folder. I guess ill have to wait 7 minutes every time i want to play. I really have no idea how or why, but important thing is that it works now.
Ty for you help.