/usr/bin/pulseaudio:6:transport_state_changed_cb:pa_hook_fire:pa_bluetooth_transport_set_state:pa_bluetooth_transport_unlink:rfcomm_io_callback

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding pulseaudio. This problem was most recently seen with package version 1:12.2-0ubuntu5, the problem page at https://errors.ubuntu.com/problem/23c16d54f398bab7ef2d00f464fb9617535fab5d contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software developer, you can request it at http://forms.canonical.com/reports/.