Thread stuck in device driver - RX480

Hello,

I'm having trouble with random system crashes. I get loads of different varieties:

1. Thread stuck in device driver (BSOD) with dumps files.
2. Red screen of death.
3. Screen going black, but with motherboard CPU and DRAM lights blinking on Gigabyte AB-350-Gaming 3 mobo.

The dump files when I view them in BlueScreenView have two things highlighted in red:

atikmdag.sys
dxgkml.sys

I have tried two different AMD drivers for the GPU. One does seem more stable than the other (but neither are entirely stable).
Less stable - 17.7.2 (recommended by AMD Radeon Settings).
More stable - 17.6.2 (recommended/tested by MSI).

Hoping that someone will be able to help me debug what is going on.
Regards,
Phil