Please try the following steps:
In this steps we uninstall your AMD Driver and reinstall them.
2. Disable Automatic driver installation (This prevents automatic driver installation because Windows installs older drivers).
3. Go to Safe Mode by holding down SHIFT while you click on restart in the start menu.
4. Start DDU and select "clean and restart"
5. Download the newest driver and install.
Download Radeon™ RX 400 Series
- You don't have to do step 2 if you own Windows 7 or 8.1.