Something weird happened today..
I was using driver 16.11.4 and I got a notification that it was available a new updated driver, even that I disabled this before.
I declined the update, a couple of seconds after my screens started to flicker and I got that windows warning sound that a new device was found, I restarted my pc and it got stuck when loading windows, so I restarted again and when it got back to windows it was showing only 2 GPUS, I have 3 and the driver version was 16.6, instead of 16.11.4 that I was using before.
I removed the AMD driver, installed back the 16.11.4 and now it is working as usual.
I have a friend that had a problem after this update alert, he has one GPU only and after this update message his pc got frozen and he had to restart, he was using the 16.6 driver already.
similar just happened to me except for the driver actually being installed but i just had a popup to install driver 16.12.2 over the 17.1.1 im using and i dont have auto driver update enabled.