A fellow user pointed out this link (Roon --> AVR --> Projector / HDMI outputs reset whenever I turn on/off projector - #3 by Marco_de_Jonge). I suspect it could be HDMI related (hence the title) and I’m painfully aware of HDMI handshaking. That thread indicates that ROCK could potentially work (not supported on that NUC) but the issue is with a Roon server running on Windows. That would be unfortunate.