Some of my rigs has begun to close the miner right after the pool is defined. If i plug a screen/or dummy in the onbard GPU (and therefore enabling it) it work fine.
It even do it on my gamer PC with a screen connected to the GPU (GTX 1080ti) very annoying that i have to have a dummy in the onboard gpu giving me a screen i can't control.
I see it on Asus mb B250 mining exptert, Asus Strix Z370 and Asus Strix Z270 with diffrent CPUs, all with Nvidia GPU. Any suggestions to running without the dummy?