Have you been able to locate the problem yet? Have you talked to your reseller about this issue?
How often does the system restart, once every hour...once a day....intermittendly
Perhaps you can tell us what the actual situation is at this moment? Have you for instance tried removing the ServerView agents? When you were installing the server did you use ServerStart?
Please let us know what you have tried sofar.
PS Obviously you may write your answer in German