Hello, we are sorry you are experiencing issues with our game.
Could you please export your game log files from the launcher?

Steps on how to export logs from ARMA 3 Launcher:

1. Start ARMA 3 Launcher
2. Click the Hamburger menu tab in the launcher (Top right corner. Next to Options (Cog wheel icon) and Minimize Button)
3. Drop down menu will appear
4. Select: Prepare Arma Troubleshooting error and save those files
5. A notification will pop up with the name of the generated file

Please note that the files might take a while to collect.

Attach the generated files to the ticket. If the files are too big please use some free file sharing service.

Thanks for your reply, that's it ?

Hello,

thank you for your report and files. It seems that your problem is that DirectX crashes. This may be from various reasons, such as outdated DirectX, outdated drivers, overclocked CPU or GPU [by manufacturer or user] and many more.

Sadly, there is nothing that can be done from our side. I linked this problem to bug number #0000579, where you can read useful tips in comments. Also, please check out the forums page for another useful tips:
http://forums.bistudio.com/showthread.php?147598-Endless-DXGI_ERROR_DEVICE_REMOVED-Crashes

Sorry for the inconvenience, have a nice day.