Its been a while since i last used my steam link but i am not having any luck in this current version with the Pi3b+ , the screen almost immediately goes blank (Like actual display signal loss) and only shows a picture once in a while. After ending the stream on the devices end it goes back to normal.

The image is a year old, its the Supreme Unified image which is based on Raspbian Stretch.
Its not running in a desktop mode and the terminal had no noticable errors i never had before.

Updating the kernel and/or mesa solved it.