Hello MacRumors forum, first message here. Anyway, lets get to the point, shall we? Recently I've been getting strange notifications, but only the sound - no text or anything - so it doesn't show up on the notification center. I've been to settings - notifications and turned off sounds on all the apps in there: didn't help. It's been happening maybe once every few days, so it didnt bother me that much, until today, when I got one notification just 10 minutes ago and then now 4 notifications in a row! It sounds kinda like a bicycle bell or something similar to that. If anybody has any idea what app could it be then it would be very very helpful. At first I thought it was either wowfx or deluxefx, but I have push notifications turned off for both. So I have no idea what could cause this..