After I installed the patch 2 . I apply this setting below and I've played for about ton of hours without crash like before . I am using ULTRA . Hope this helps you guys . 
Through Origin:
1. Right click on the Dragon Age Inquisition title
2. Go to game properties
3. Type the command line parameter in the Command Line Properties box.
Once there, add the following command line parameter: -ShaderSystem.ShaderQualityLevel <quality setting>
In this instance, <quality setting> should be one of the following:
An example of how to set your quality to high would be: -ShaderSystem.ShaderQualityLevel High