I have the same very same issue. The workaround does not work for me as it also occurs when my computer is back from sleep. In this case the network is reset and Evolution start checking e-mails in all accounts (I have also quite a lot of them).
I have to kill Evolution and restart it. Nothing better for now. -- Pascal Obry / Magny Les Hameaux (78) The best way to travel is by means of imagination http://v2p.fr.eu.org http://www.obry.net gpg --keyserver keys.gnupg.net --recv-key F949BD3B