I have an R9-270 and had some problems with recent drivers. Now the newest driver seems to be working fine but late 2017, early 2018 drivers seemed to have issues. I eventually did the AMD cleanup tool and just let Windows 10 decide which drivers to install. Those older Windows-certified drivers were very reliable. Just in the last week I finally updated to the latest August, 2018 AMD-supplied drivers and they seem to have finally resolved their issues.