Ok. I eventually did have similar issues with Thunderbird, but not
nearly as severe. Further investigation indicates it is probably the
same bug as 279102 (network card issue).
Sorry for the wasted bandwidth.
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evolution appears to cause network connection instability
thank you for your bug report, that's not an evolution issue if the card
is not stable though
** Changed in: evolution (Ubuntu)
Importance: Undecided = Low
** Changed in: evolution (Ubuntu)
Status: New = Invalid
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evolution appears to cause network connection instability