I have a MSI Vega 56 (Hynix) and this card is crashing the whole 6x Vega rig (Windows 10) when mining CryptoNight-GPU. It seems like this card is getting strangely hotter than all others when mining this algorithm as well. Usually it's the colder card of the rig.
P7 is at 1408;950
Mem3 is at 890;945
cn-gpu is core heavy. maybe you were mining coins that weren't core heavy before?
Check the fan control on this particular one, check positioning of this card.