It's the beginnig of the end for that strut. That's how it always starts. Mine did that too. Just wait til it becomes consistently flat. Well, I suggest you fix before it gets like that. If it deflates when you drive then you really have an issue.

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2004 X5 4.8is - X-pipe! V1 hardwired, Invision DVD headrests, N62 Intermediate Levers Fixed! FOR SALE!!! Contact me if interested!

1999 LSB M Coupe - Heavily modified
2008 M5 Sepang/Portland - Bone stock
2010 Mini Cooper S Laurel Sport Edition #1/100
2002 525iTouring - Alpine/Beige