Do you have a way to tell if a device "suffers from the MicroUSB connector problem", other than one day disconnecting and having the USB socket coming out of the N900?

All we have is guesswork: perhaps it was a design problem that was fixed in some stage. Perhaps is was a manufacturing problem specific to some batches. Perhaps it is a random manufacturing problem. Perhaps all devices are identical and the problem happens due to force/angle used to connect/disconnect.

The only thing we do know is that this problem is very common, and that Nokia does not always fix this problem. And we also know that many devices come out of warranty about now.