problem with gpu- intel hd4600/nvidia gt860m ???

First of all I would like to say that when playing  Beta I haven't got any kind of problems with performance and game in particular.  But now when I start the game i have the window about wrong Intel drivers....I start the game on nvidia card (game is optimized in nvidia experience)but some times game crushed beaucouse Intel driver stopped working???????  any time I leaving the game I have window- program stopped working, windows is looking for solution....I have the problem with performance during playing on medium settings. BUT beta version was working with any problems with high settings!! some times game just crush during play with window- battlefront stop working....can't fu...ing believe it!  during loading the game sound is crucking and freezing for few seconds...some times game runs with no sound at all - I have to turn off and on again....

I was looking for solutions here and on the web but non of them is fixing the problem.......it is bad beaucouse I bought that just becouse it was working perfectly on beta version. Now it it frustrating and unplayable....waiting for some real solution or want my money back!  what kind of politics is that EA???

my spec: MSI GE70 2PE----intel I7, 16gbRam, nvidia gt860m, win7,