My guess is browser alert!
Are you subscribed to one of the browser push services, like Accuweather?
If you are and have the profile set a certain way, it will alert each time the data refreshes. Mine was defaulted to BBRelaxed_Levitate out of the box and it only does it if I use the LOUD profile.
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Z10 and PlayBook <- 9650<- 9630 <- 8330 <- 8130 <- 8830 <- 8703e <- 7130e <- 7250
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