audio source not showing in audio mixer

I had my Firestick connected to my PC for a while. I was using a capture card and OBS. Everything was fine until today. I used the PC and the Firestick was working perfectly together during the day. I leave the house and come back hours later and the sound from the Firestick is not working. I...

I have just purchase the Vocaster two audio USB interface and using with OBS Studio. Got it setup yesterday, all worked great. Today I open it, and my vocaster is no longer showing in the audio mixer. I tried " unhide" and that did nothing. I check the audio mixer advanced settings and it shows...