Whenever vulkan is enabled, Yuzu freezes the whole system and needs a hard restart to work again. I have a AMD Radeon 520 card
In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.
Make sure you are running the latest driver version, 20.11.2 for now.
Yuzu’s vulkan is still in it’s early stage of development, your Yuzu just froze your device but mine damaged the gpu drivers.