Seems this is quite a common problem. I don't know if it helps at all, but there
are a couple of user submitted patches in the Ubuntu bug system aimed at sorting
it out.
The one at the bottom of this thread allows a user configure the reconnection
timeout:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/64173
Here's another related bug:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/37821
Also, after using network manager to get your connection up, issuing a kill
-STOP to the NetworkManager process seems to stop the reconnections.
Cheers
Chris
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