That sounds so wrong. I will give it a check and get back as well. Anyone else who claimed promocodes here faces the same issue?
Actually your right. It seems that was causing the problem but then I deleted more stuff and had 1.2GB of free space and the problem came back after a game or two.
We just released an update for the game (should show on the store in some time) which fixes the audio issue. Do update and let me know if the issue persists.