Cluster Gateway Down Problem

Hello,
I have a question about the use of Materials Studio with a gateway to run the jobs in a cluster. We frequently encounter a problem with the gateway such as when we click on  the link for "Gateway Data" we see "???" in the line for "queuingsystem". When we share this issue with our Academic System Administrator, he restarts the gateways and the problem is fixed, and we do not see "???" anymore, we see something written about the Grid Engine. Do you have any idea about why the gateway turns down so frequently? I mean we encounter this problem almost every week at least one time. 

Kind regards,
Cigdem.