I am also having problems. ..
I decide to finally install an aux cable into my car that went from the two Red/white RCA cables on the back of my car deck, to a 3.5mm jack. So I can use my droid in my car, and my brother can use his Ipod touch when he use my car. Anybody can plug in their multimedia device.
anyway during the install i had removed my car dock from my windshield, i have it just under the rear-view mirror for Google maps...
i finally get everything installed and put the Car dock back up and plug my phone into the newly hard wired 3.5mm aux cable and my car charger and I grin and sit back and jam out to Pandora...
2minutes later my car dock tragically falls from the windshield and dropping my droid and all to my center console, bouncing off my Stick shift. . .
I almost cried... I bucked up and put the car dock back up on the windshield and it happened one more time .... so i used an alcohol wipe, put up the car dock and made sure it was secure and left it over night to set without putting the phone weight on it.
The Moral of the story is, my droid will now not charge unless the micro plug in is at an angle where it is pressing upward toward the motorola droid's screen. Basically, away from the battery, pushing the connection together. I proceeded to using my multi-tool's needle nose and pulled the tabs on the car charger upward on the micro usb connection. these were spoken of earlier.
i also took another tool and bent the inner connection for the micro usb on the droid downward. These two quick fixes i discovered worked for a short period of time, but still i have to lay my droid down flat to get a clean charge it will not charge in the car dock unless the cable is pulled forward (toward the front of the car) at an angle, to temporarily correct the bent inner micro-usb connection. Soon i wont be able to at all I'm guessing. Most probably the small amount of people experiencing this problem, is probably due to us or someone dropping the phone while charged in, causing the charger apparatus to be damaged internally on the droid...or accidentally bending that internal connection the droid has for charging thru the micro-usb port.
i think i will need to backup my phone and save up 50$ for a new one . . . =(