I had a strange issue today on a 3rd party vendor's SQL Server. This is a VM running SQL Server 2012 SP1. The min and max memory settings are set to 9GB. Task manager showed SQL Server was getting the 9GB. SQL Sentry shows over time the buffer pool was getting smaller until eventually we were not able to connect with SSMS. PLE was in the single digits.
The CPU was at 40% for a couple of days prior and I singled it down to Resource Monitor. This appears to be a symptom of the memory issue.
The vendor restarted the service and everything is back to normal.
I found this KB2845380 and think this might be related but I'm not sure. Has anyone run into something like this before? From what I've been told this has happened every month or so.