Ok, my initial assumption, that it might be due to me disabling
networking before hibernating/standby is incorrect. I tested it both
ways, and the behavior is random, and not dependent on previous state.

So there are two parts of the bug:
- minnor annoyance, that the networking is always enabled when coming back from 
standby
- that driver needs to be restarted sometimes

When second problem happens, restarting NetworkManager or
unchecking/checking "Enable Wireless" fixes it.

This potentially might be also a kernel issue, perhaps the driver is not
always restarted?

In Bug #276990 I noted that today when this problem happened, and I
tried to toggle off/on "Enable Wireless" it crashed the system. It might
or might not be connected together.

P.S. Sorry for delay, but I needed some time to get more details abut
the bug.

-- 
Network Manager sometimes needs to be restarted when coming back from 
Standby/Hibernation
https://bugs.launchpad.net/bugs/288922
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