Not surprised. I've had horrid luck with AMD gpus graphics drivers over the years. Everytime I try and give them another chance their terrible drivers drive me away again (I miss ATI).
Now Amd do fix things in time but things move WAY to slow. Honestly I believe thats where the adage about AMD gpus aging like fine winecomes from. It takes years for them to extract the full power of their gpus due to this driver fumbling. Where Nvidia tends to have their gpus running at full sprint within weeks or months of a launch (ie hardware and/or games) . Amd gpu users pick up on this, consciously or not and end up buying Nvidia down the road. Amd ends up kicking themselves in the teeth with what could have been superior hardware over software. Amd needs to focus on their software engineers a lot more, hire or fire.