Notifications failing to sound after awhile...?

[exi]

This is something I've experienced in three ROMs here -- Calkulin's (which I love), Mighty's (which I also enjoy), and Groove's -- so I'm not sure what the story is.

I've noticed that, after being left on vibrate or silent for all notifications for awhile, I'm unable to turn up the volume. I mean, I can turn it up via the rocker switch for volume, but incoming text messages don't actually make a sound.

Unsure if phone calls do.

Anyone know what I'm talking about?