My mac mini loses connection with my receiver after turning off the receiver then back on

My Mac Mini loses connection with my Onkyo receiver NR-609 after turning off the receiver then back on.  The only way to reistablish the connection is to unplug then replug the HDMI cable to the Mac Mini.  There's no effect if I unplug then replug the HDMI to the receiver.  Any help or suggestions would be appreciated.  I've searched a lot but haven't found much of anything so if this is covered elsewhere I would greatly appreciate a link.
Thanks in advance

Hi and thanks.  I don't know about the audio prefs.  When it happens I am not able to see or hear anything from the computer until I un/re-plug the HDMI to the Mini.  I'm not sure it's changing to something else because there's nothing else connected for it to change to.  I could see that perhaps the audio will change to the Mac Mini's internal speaker. 
I found out last night that if, after I lose the signal,  I use my ipad to play a video on the Mac Mini using the Remote app and home sharing the signal gets righted and I can see/hear the computer again.  It's quite an inconvenient fix though and I wish and hope someone here can help me.

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