As I said in my own post here....I got exactly the same issue, and that was after the Windows 10 latest big patch ( 1803 ) installed. I'm on R5 330 ( it seems to be a dual processor with R7 as well or something ). You haven't said whether 1803 update installed on yours. I was also on 18.2.1...which the software said was the latest version. But apparently 18.4.1 is the driver for the Windows 1803 update.
In my case I got messages saying the 18.4.1 was 'not signed'....even though I had downloaded it direct from AMD. And...I could not uninstall it from Programs and Features. The uninstall just hanged. Luckily I had kept the exe file for the 17.4.2 driver and installed that worked and updated to 18.2.1 again.
And the worst aspect is....the Windows update wants to install again.
Try using the AMD Clean Up Utility application from their site and then install the new driver patch, see if that works. For me my issue got worse today when I booted up my pc and all I saw were distorted images and colors. I tried restarting my pc a few times to see if there was any change and it still had a distorted image. So I just replaced my current video card with an older model and it seems to fix my issue entirely. Really bummed out my r9 390 fizzled out only had it for 2 years on it and my warranty ran out like 2 months ago. In the end problem solved I guess...