I used to have this problem with the regular WiiM Amp long time ago, but it was fixed with a software update.
Now I switched to WiiM Amp Pro and it has this problem again.
When it's connected to my LG C9 TV via HDMI, and the TV audio output is switched to something other than HDMI, the Amp Pro starts to produce very loud crackling/static clicks and pops until the TV is switched back to the HDMI output.
The HDMI denoising option doesn't resolve this issue, and I don't recall enabling it for the regular WiiM Amp.
Now I switched to WiiM Amp Pro and it has this problem again.
When it's connected to my LG C9 TV via HDMI, and the TV audio output is switched to something other than HDMI, the Amp Pro starts to produce very loud crackling/static clicks and pops until the TV is switched back to the HDMI output.
The HDMI denoising option doesn't resolve this issue, and I don't recall enabling it for the regular WiiM Amp.