I had the same problem and found a fix but sadly it probably won't help as it involves removing the 2nd GPU and you can't do that with the 295X2....
Dunno if any of it'll help but the other bits may be worth a try or id possible use another, same series single GPU to install the driver the way I did above then refit the 295X2 and see if that sorts it. (so long as you have someone to "borrow" an AMD GPU from temporarily). The link to the MS page might help with stuttering and shutdowns due to driver problems as well.
Hope you get a result soon