Very high packet loss in burst

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http://serverfault.com – We sometimes have 90%+ more packet loss on our server, but it does not always appends. Right now it works perfectly, but just half an hour ago, it had just that problem. Our service provider is telling us to go in a recovery system to test if this is really a hardware problem and not software on our side. However, I don't see anything that can cause packet loss on our side, especially if it is not consistent. Is there anything we could check before doing an other test on the recovery system? We have a dedicated server at Hetzner.de. It is connected to 100MBit ethernet. We did not try to ch (HowTos)