I've Zabbix running for a month now and all is working very well. But one thing that bugs me is the unreliable processor load reporting, it goes occasionally sky high without any reason. For example, see this image: 
At about 8:41 I restarted the agent and the load immediately went down. So somehow the agent (sometimes?) isn't sending the correct values upon restart. Unfortunately I've seen this behavior on different machines, so it's no incident.
What could be the cause of this? Running version 1.8.8 on both agent and server.

At about 8:41 I restarted the agent and the load immediately went down. So somehow the agent (sometimes?) isn't sending the correct values upon restart. Unfortunately I've seen this behavior on different machines, so it's no incident.
What could be the cause of this? Running version 1.8.8 on both agent and server.