It wasn't Wiim pro fault, it was the DAC topping D50s. The D50s has a factory bug that causes problems when using the coax connector. The problem is the wrong choice of resistance parameters. This can be easily fixed by making a mod on D50s.
I have only polish version description
https://sites.google.com/site/sq5ebo/topping-d50s-coaxial-mod
I have made a mod that improves the proper resistance of the coax connector in the D50s. I am currently using the correct 75R cable and everything works fine.