Comment # 5 on bug 851414 from Philipp Seiler

I would suggest to remove the start of the gnome-settings-manager in the config
when starting i3. Because this is causing the issue and it's kind of a
background process running in gnome (not necessarry in i3) there is no need to
fix it in i3.
With the standard configuration the issue isn't present.

This is my autostart:
exec /usr/lib/polkit-gnome-authentication-agent-1

exec nm-applet
exec pasystray
exec blueman-applet



polkit authentication agent is for saving settings to polkit without root and
something (needed for network manager and some more applications)