Database Server us down (93)

Last 2 weeks I have gotten this error

Netbackup Administration Console

Unable to obtain the server list from the Enterprise Media Manager Server

Database Server is down (92)

I reboot and everything is fine again.

Master/Media are on the same server

Windows Server 2008 R2

Service Pack 1

Some reason down to 3gb on space on the server not sure if that would make it crash?