Mmmm this error sounds a lot to me.
If it is a "random" error that happens only sometimes, and you have SAS 9.4 TS1M1 (SAS VA 7.1 I would say), then I think that your ActiveMQ server gets full. Please follow the steps on this SAS Note: http://support.sas.com/kb/53/801.html
I googled a bit, just in case than it might be something differen and I found this: http://support.sas.com/kb/52/871.html.
This would be the case if:
SAS Visual Analytics explorations might load slowly if they use the following:
- categories with Numeric specified as the format
- custom geography data items
I hope this can help a bit!