Ugh, I'm having the same problem with my phone! My cover came off in my pocket twice in an hour!!
I've had this phone for less then a week!
This is a total defect and I just emailed Motorola about it trying to get a replacement.
They really need to either send out a recall notice or send out an announcement to everyone with a droid and offer replacements.
If they don't fix the door issue I'm afraid the phone is going back. (Which would suck 'cause I'm already in love with it)
Why would they recall when very few have the problem? Getting a free replacement door from Motorola, if your Droid does have the problem, isn't good enough to you?