I think I can shed some light on this issue. I just did various tests because I have the same issue. I noticed if you completely disconnect the charger and insert the bionic in the dock the car dock opens 100% of the time. I'm using my car charger from my original Droid. Can any of you check and verify this also for I the few of you that don't have issues are you using old chargers or a new one? This could be a wire issue and not a phone issue.
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