The SFX for unlocking a Room play constantly, whenever I take any action after a Room enchantment was played by my opponent and then a second one with the same name and door unlocked was played.
The sound started playing for almost each action as soon as the Rooms stacked on each other. This includes just targeting the room with my mouse, assigning attackers, casting creatures or spells targeting a creature.
It seems that each additional Room in such stack makes an additional sound, making the issue even worse.

Repro: 10/10
1. Play a game with multiple copies of the same Room enchantment in your deck
2. Proceed until you draw two or more copies of the same Room.
3. Play two copies of the same Room with the same door unlocked.
4. Pass the turn, so the enchantments stack on each other visually
5. Move your mouse cursor onto and away from the stacked enchantments, or perform any actions in the game (cast creature spells, assign attackers or blockers).
6. Listen to the SFX playing over and over again