Go into Radeon Settings / Gaming / Global Settings / Global Wattman: find the red "Power Limit" slider. It is down below the fan and temperature settings toward the bottom. Slide the red horizontal slider all the way to your right to it's maximum. Likely this will be 50, whatever it is to it's max. This will allow your card to get the power it needs, the drivers for a little over a year have been starving the cards and some games are okay and some aren't. This should help your stability. Please also set your Windows power plan to "High Performance" not the default of balanced.