Are there any known problems regarding the Mitel wireless headsets for the 5340 phones? I purchased a couple of these and one is having an issue where it constantly drops connection, as if the battery is dying. Removing the battery and reinstalling works for a day - about the next day its dead again. User charges it every night and also charges it when she's out to lunch.

Mitel 3300Mxe running MCD 4.0, 5340 Phones