calvin, you have all the typical symptoms of a ZF transmission. you're at the magic number (100K miles) where things are starting to show wear. the downshift bump you feel when coming to a stop is fairly common. it's something you may have to live with. the hard shift in 2nd is most likely wearing shift solenoids. nothing you can do other than replace them or try a fluid drain and replacement. good luck.

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2006 4.8iS Black/Black with custom Audison Voce/Image Dynamics sound
Production Date - 10/05