I can confirm the problem is there on the Curves with V4.2.2.67 have also had at least one customer with a V4.2.2.68 device that had problems also.

The strange thing is I have two here, both with the same software (V4.2.2.67), same carrier, etc and one always has bluetooth problems and the other so far has been rock solid. Don't know if this actually proves anything though as one (the one with the flaky Bluetooth) seems to get more use then the other.