So I have observed this a few times, maybe 3 times total, and the only thing I can think of it being from is playing music. I only have one contact with a custom ringtone (it's a stock ringtone). A few times it has defaulted to my main ringtone (custom mp3) . And the only thing I did with my phone today was make a few phonecalls and listen to some music (mp3s on sdcard). When I go to fix the ringtone, it still shows the correct custom one selected. And then I think it works after 're-selecting' it. Feels like a bug in the OS. Maybe it is fixed in 4.0.3 or 4.0.4. Anyone else notice something similar or confirm its fixed on a different rom?