Greetings, I have bought RX 6600 10 days ago and I was using it normally till today.
Today, I opened the "Instant Replay" and "Record Desktop" options from AMD Adrenaline Software and I realized I was having coil whine issues, when I turned it off, it returned normal as if nothing happened.
I wondered if it was related to my software or hardware, so I reached out my friend who use RX 6750 XT, when he also opened those settings, he started hearing Coil Whine as well.
Both mine and my friend's Adrenalin Version is 23.9.1, we are having same issues so it may be driver related, fyi, good days.