I had to restart Network Manager at some point and things started to work as expected when resuming from standby (suspend to RAM)...
I suggest people having the issue update their system and try again. Please post whether this fixes the issue or not.

On 23 December 2014 at 15:27, Tobias Bora <tobias.bora@gmail.com> wrote:
https://bugs.kde.org/show_bug.cgi?id=339674

Tobias Bora <tobias.bora@gmail.com> changed:

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                 CC|                            |tobias.bora@gmail.com

--- Comment #12 from Tobias Bora <tobias.bora@gmail.com> ---
I can confirm this very annoying bug, please try to solve it soon... I can make
any tests you want to help you.

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