is this a VPS ?
You never know who dabbles with the machine.
I used to run a server on a virtual machine, now this was like 1% Linux with the smallest CPU-usage (it was a barely used e-mail server) and the rest was a dedicated server for ARMA 3. The performance just plummeted when 45-50 players were playing. I reported the issue and was told by the community that ARMA 3 really suffers with virtual machines. It needs a non-vm environment to be able to perform decently.