How long does your session stay active before it drops - is it always the same duration? This is probably due to network (TCP/IP) or firewall timeout rules. For example:
http://support.sas.com/kb/47/825.html
There may also be stay-alive settings in SAS Management Console that can help here - talk to your SAS Admin. This thread explains where to look:
https://communities.sas.com/t5/SAS-Enterprise-Guide/SASEG-5-1-disconnects-after-1-hr-by-the-firewall-timeout-rules/m-p/181707#M13900
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