I agree with the above. I now have two BTA's and my first one acts different than the second one. At first I paniced everytime I saw the first one "look" different than it was suppose to and now it has a daily routine for itself and is fine.
Also, if your BTA ever does get stuck in an intake, advice would be to shut off the power to that intake and allow the BTA to remove itself. I've read horror stories of people shutting off power and pulling the nem out of the intake only to do more damage. I would imagine you take that route only if the nem is in danger or can not untangle itself over a period of time and only then proceed with caution.
Good luck! =)