Alarm often does not sound with a ringtone from SD card

[chrisboyle]

If you choose a ringtone that happens to come from the SD card, then quite often (maybe half the alerts) the sound is not played. The notification appears, vibration occurs, and the "Notified!" message is present in the log, but there is definitely no sound. If the ringtone is on internal storage then it is played correctly every time. I smell an OS bug here, because the app doesn't (and shouldn't) care where the ringtone comes from; it just puts a Uri that comes from RingtoneManager into the Notification's sound field.

[chrisboyle]

Also asked on StackOverflow: http://stackoverflow.com/questions/3348931/why-are-my-notifications-sometimes-silent-with-ringtone-from-sd-card