17.9.2 drivers, after uninstalling 17.9.1 and using DDU
Sapphire Trixx v6.3.0 been in place before na dafter new driver install, with fairly aggressive custom fan profile (linear profile so 100% fan at ~75C)
Had an instance over last few days where screen was flickering with corruption, above custom profile was not being used, fan speed very low for ~55C. De-selecting "custom" fan profile and then re-selecting it seemed to sort things.
In last half hour, had an instance of fan randomly choosing to run at 100%, despite temps being ~35C and dropping to ~25C while web browsing. Rebooted PC, now back to normal.
Driver not playing nice with Trixx? Not had issues with Trixx v6.3.0 and AMD drivers for at least several months.