I have the same symptoms after upgrade from 14.10 to 15.04. I'm attaching my ubuntu-bug output, but I can file a new bug if this is adjudged a different issue.
** Attachment added: "apport.network-manager.fmm523w1.apport" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1390709/+attachment/4393443/+files/apport.network-manager.fmm523w1.apport -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1390709 Title: Wifi doesn't reconnect after waking from sleep To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1390709/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
