This is still an issue in r25.
How can I provide more information?
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https://bugs.launchpad.net/bugs/1479893
Title:
Disconnecting from or connecting to WiFi networks causes heavy system
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: indicator-network (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1479893