I have the bug again. 
I'm on rc-proposed r102, krillin, using network manager 0.9.10.0-4ubuntu15.1.7

Some stats: 
Every 10-15 seconds I get a burst of 50 PropertiesChanged which lock my phone 
for about 4 seconds.

So, every 15 seconds, 4 seconds of frozen UI.

"nmcli d" reports WiFi as connected to the office network (as it should
be).

this is the "grep NetworkManager /var/log/syslog" since I got to the office (I 
don't remember having this issue at home this morning)
http://pastebin.ubuntu.com/12123687/

this is the output of "dbus-monitor --system" in one of the 4 seconds freezes.
http://pastebin.ubuntu.com/12123712/

the output of the wifi script is
http://pastebin.ubuntu.com/12123727/



After getting those logs I disabled WiFi and the freezes disappeared (and the 
flooding in dbus-monitor with them)



Then I reenabled WiFi, it took something like 1 minute before the phone stopped 
being laggy like hell (while the wifi list was populating in the indicator 
panel)....AND THE PROBLEM IS BACK :)

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https://bugs.launchpad.net/bugs/1480877

Title:
  Access points' "PropertiesChanged" dbus signals freeze UI on mobile
  devices

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