Current mesa in solus stable is unstable with navi. I can confirm mesa 20.0.4 has solved crashes with totalwar warhammer 2 and wow in wine. I have tested this on ther distros aswell i.e ubuntu, arch. Mesa 19x is unstable and should be replaced with newer version. If you have a navi card and are currently experiencing seg faults or crashes
mesa 20 fixed it for me.