So I have the same problem and there is a boatload of information that says the Origins game has a memory leak. It was recommended several times to run the ntcore 4gb_patch. You first must have an un-encrypted daorgins.exe file on your local system THEN run the patch. This is supposed to stop the memory leak. I haven't tried this yet but there is several youtube videos on what needs to be done. I just started playing this week and started crashing right after I retrieved the scrolls during the trials. There was a mention of a location on dropbox that had a clean version of the exe file, but the link doesn't work.