Please have a look at the below metalink from Oracle.
188.8.131.52 EPM Workspace Hangs During Login (Doc ID 1643454.1)
Also Please explain what you are trying to run when this process is getting hang.
In 184.108.40.206.500 version, every module by default takes 2 GB memory. We can change to less in registry.
DAS getting stuck is normally related with long running BQY files or bqy jobs. Check for the jobs that were run during this time ,may be its doing something to get DAS hiked to 2 gig.