App domain crashed due to not enough storage available to process this command
This is usually down to memory pressure, I assume that you're running SSMS on the SQL server?  Try opening SSMS from another location and connect in, does this still produce the error?

You might want to set your max memory setting to allow some breathing space for the OS and other apps.  I usually leave the OS 4GB to start with and then tune from there if I need to.