I have quite a few Behringer items that have worked great for more than a decade.
Like I said, wish we'd have known about this particular device info, since according to berntd (citing Behringer support) it is a known issue.

In my experience, most ASIO interfaces behave better if turned on before they are needed .. apparently this device has some weird issue with that.

Maybe the drivers are poorly written to need a USB connection (source) before outputting audio signal.. ie if there is no sound source they shouldn't generate sound. Seems simple enough to me.

I do not work here, but the benefits are still awesome
Make your sound your own!