Pingthread and some monitoring stuff run every 4 min, I think that the disconnections happens before that process but because there is not activity on this agents is not detected until the pingthread passes. So I guess you have half closed connections, I mean, the agent closes the convention but the master does not received the reset packet. If you are using SSH agents, you can enable the verbose mode on the sshd server to monitor what the heck happens see https://github.com/jenkinsci/ssh-slaves-plugin/blob/master/doc/TROUBLESHOOTING.md#common-info-needed-to-troubleshooting-a-bug
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