After upgrading to iOS 5 on an iPhone 4S, at random times when I unlock (with code) my phone, the ringer adjustment alert overlay is showing. (By ringer alert, I mean the grey volume indicator overlay that appears when you use the buttons on the side of the phone to turn up/down the volume)
This alert overlay doesn't show ever time I unlock the phone, doesn't go away until I turn the volume down a notch or two then wait, and isn't being triggered by anything physical. This happened on both iOS 5.0 and 5.0.1.
Anyone have any idea what's going on? Is this a iOS bug?