Sorry for the late reply.
We've had this sensor setup on a few different robots w/ various semipermanent wirings and haven't had issues with communications with the sensor.
I would recommend not using the sensor in NDOF mode (I use IMU mode) unless you actually want absolute heading (relative to the earths mag field). The NDOF mode will be susceptible to magnetic interference from motors, and calibration is more involved in this mode of operation.
Which version BNO055 breakout board are you using? We are primarily using the Atmel board on our bots, but the ad a fruit board was used for preliminary development of the class.
If you want a more prompt response, shoot me an email at
james@team2168.org