Crashes a lot

I was so excited to get this game when it came out and played it a ton, even though my MacBook Pro Graphics card really isn’t up to snuff for playing this game. Everything was going fine for the first 6 months (right around the time I updated to OS Yosemite, however, now the game crashes all the time. It is to the point where it is nearly unplayable.

MacBook Pro (15-inch, Mid 2010)
2.4 GHz Intel Core i5
8 GB 1067 MHz DDR3
Intel HD Graphics 288 MB

mmcleant about Total War: SHOGUN 2