I've been looking for an answer which I found and noticed in my searches that there were a lot of others having the same problem.
My solution was to upgrade my 8700c to version 4.2!
See this forum for download location: http://www.blackberryforums.com/gene...nally-out.html
Note that once you do the install, before syncing my BB you must remove the Vendor.xml from the BB under: C:\Program Files\Common Files\Research In Motion\AppLoader - Just delete the file (if you are not in Venezuela)
It loaded and works find on my unit and now I have Bluetooth headset functionality without the disconnect!