RX 480 Nitro+ undervolting problem

Hello folks! I have tried undervolting my card to decrease heat and power consumption but when I change wattman voltage slider to manual, display driver crashes during the games with showing artifacts. The problem is, it crashes even if I don't change any voltage settings, changing wattman voltage slider to manual (in stock settings) causes crashes in games and benchmarks. Changing back to auto seems not working to solve crashes too and I have to reinstall drivers to prevent crashes.

 

Any ideas? Thanks!

 

 

Specs:

GPU: Sapphire RX 480 Nitro+ OC 8GB

CPU: FX-8350 @stock

MOBO: Gigabyte GA-970A-UD3P

16 GB RAM

PSU: High Power 750 Watt +80 gold

Drivers: 17.1.2 (have similar issues with all other drivers)