Why would my laptop Bluetooth device monitor use 100% of one CPU with no bluetooth devices connected?

Are there self-maintenance routines Bluetooth’s device manager does every few weeks that would draw enough processor time to use up 100% of the capacity of one of the cores on a multi-core processor? Or is somebody elsewhere in my area hooking into my bandwidth? How do you ensure your Bluetooth installation is sufficiently secure? Having never yet used it, I left the settings to the default that come with my Asus Notebook.