/usr/sbin/iio-sensor-proxy:ERROR:iio-sensor-proxy.c:186:send_dbus_event: assertion failed: (data->connection)

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding iio-sensor-proxy. This problem was most recently seen with package version 1.1-1, the problem page at https://errors.ubuntu.com/problem/2e9fe2906852e70c0d096664d8f31efb75f53df7 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 you can request it at http://forms.canonical.com/reports/.

also 1.3-1ubuntu1
https://errors.ubuntu.com/problem/73157c0b82f6433fb903371e9f6e08c6788fabc4

[Forage (forage)]

This issue has just been fixed in the just released version 2.2: https://github.com/hadess/iio-sensor-proxy/issues/147

I ran into it as well.

[Launchpad Janitor (janitor)]

This bug was fixed in the package iio-sensor-proxy - 2.2-0ubuntu1

---------------
iio-sensor-proxy (2.2-0ubuntu1) zesty; urgency=medium

  * New upstream release (LP: #1644246) (Closes: #855667)
  * Add watch file
  * Drop all patches, applied in new release

 -- Jeremy Bicha <email address hidden> Mon, 20 Feb 2017 20:34:12 -0500

[Forage (forage)]

I can confirm that installing the 2.2 Zesty build on Yakkety fixes the problem for me. There are no longer instability issues when starting Ubuntu.