I read somewhere once, and have experienced, that a blue screen (crash) usually indicates memory problems on the card (overclocked too much) and a black screen indicates core problems (again with overclocking core too much). Also trying to run too low of a power limit or voltage can cause crashes. If down clocking doesn't solve your problem look to drivers as the next in line to fix.
It was the drivers, in C:Nvidia folder I had 3 different drivers, removed all of them and let the last one and it is running stable since yesterday night more than 15 hours no problems, hopefully it is fixed. I let all cards in stock settings as I thought it was overclocking but it was not. I have to try now with a bit of over clock as 1 x 1060 plus 2 x 1050 ti is giving me in latest 1.8.1.5 in Nicehash 0.0004 btc daily with a bit of overclocking maybe I can reach 0.0005 btc daily with which I would be happy.
