The only reliable way I can get screen mirroring with both video and audio to work is to reboot both my Roku Express and my Samsung Galaxy S9+ just before trying to use it. The first time I ever tried it, it worked flawlessly, but if I try again, there are always problems. It either won't connect at all, or will get video but no audio. Sometimes just rebooting the Roku fixes things, other times just rebooting the S9+ fixes things. The only reliable 100% way is to reboot both. Is this ever likely to be fixed or will Roku blame Samsung and Samsung blame Roku till the end of time?