Just found out that this is a problem lots of people are having , the editor freezing and only way out is resetting the system.
anyway it appears that its already being worked on ticket UE-42280. and it is expected to be corrected before Version 17 . well lets hope.
as a work around I used -d3ddebug after the Ue4editor.exe -d3ddebug although I don’t know why I was able to run the editor for far longer than not doing this. I’ve now been up for three hours straight by Setting The editor to forward rendering. ??? this seems to be a workaround till the actual problem is fixed. and so far so good. ill mark this as fixed although its more of a band aid solution. hope this helps others.