Plasma started crashing

[Xen]

So I an an update today but now that I think of it I also exchanged a 
graphics card (same driver, no driver exchange).

I don't know which is which at this point but plasmashell crashes about 10 
times per hour.

I assume it is going to be the graphics card. Makes KDE nigh unusable 
though. One problem gone (the tearing with the other card) a new one 
arises (I have had another card in there, so of the say 3 cards in my 
possession from nVidia, 2 don't work. And this is just a very new card, 
nVidia GTX 950).

It doesn't get much better does it...