Long running jobs Robot Enterprise Server

Wondering why we get these messages for Long Running Jobs to unix server from Iseries Enterprise Server<br> <br> <br> R164011 Lost communication with Enterprise Server<br> R164012 Trying to establish communication with Enterprise Server<br> R16404&#160; Communication with Enterprise Server has been established

We get these too.&#160; If i'm not mistaken, they happen in almost every 4 hour intervals.. Might be some sort of reset??