I wasn't sure which model I had but I looked and I have a BC1706L Topline DTS (Digital Transmission System). Supposidly the same as the BC2006 in transmission method at least where I could see. Could be the BC2006MHR Topline DTS uses a more advanced version that is dinotte proof which would have made it worth the additional cost if I knew i'd have issues like I do.

When my unit cut out the whole thing cuts out. HR and Speed. There have been a few times after putting my raceblade fenders on where I jiggled the sensor and bit and had to fix it a few times on a ride to get it right again but that is just user error.

To avoid the issue my computer is on the left before the bar tape while my light is on the right underneath on the start of the bar tape. I then have the wire going down to the right side of the steering tube where the battery is mounted. It was the only easy to change battery spot that reliably provided no interference to the sigma.