i can't tell you anything about the hardware. it's a server from "professional gameserver", has 10 slots and costs 15€ per month. but we had the same problem with a server from gameserver.4player, 4 slot, 4€ per month (german provider) and also with a server that a friend has at home, he runs some teamspeak server, 1 ark server and a website on it without any problems. the problem keeps occuring so i think it's the game somehow and not all these different servers.
server_ini.txt