I need help to put the server to auto restart every 4 hours.

Hello guys!
I'm new in the community and little experienced with server ARMA 3.
Some days I decided to know the ARMA 3 since I come from BF3 and BF4.
With this I set up a dedicated server for our CLAN.
I see that bigger problem gun on some computers is falling FPS. And I want to improve it by trying to leave the server with AUTO RESTART.
Already I ran this forum and not found a way to do it. I would like to please ask if anyone can help me, please.

Another thing I noticed that one of the missions with the name of hackers does not work, I tried to do what I found here in the forum and have not had success.
Who can help me I'm very grateful.

I hope at some point help too. Thank you!!