How can I avoid Thunderbird timeouts when switching network connections?

I'm using Thunderbird 24.4.0 but this problem goes back many releases.
This problem happens when I switch from an external WiFi network to my company's internal LAN (ethernet).
I'm connected to the company's email server via WiFi from home and can get and receive email no problem. I then turn off the WiFi, put the laptop to sleep, take it to work, wake it up, and plug in the Ethernet cable. I click on Get Mail and in the status bar at the bottom it says "Connecting to [servername] ..." and stays that way until I get a notification that Thunderbird timed out. I click on Get Mail again and this time it says "Connected to [servername] ..." and it gets my email. (It may have briefly said "Connecting to" prior to "Connected to" but I think I've only seen that once.)
Why does it never work the first time but has to timeout before it will successfully connect, and what can I do to get it to connect without having to go through a timeout cycle?
Thanks,
--Steve

Networking is an area of some frustration. Recently, some bug reports are seeing progress. The place to be to test these fixes is in development builds
Note yet fixed:
https://bugzilla.mozilla.org/show_bug.cgi?id=939318
NetworkLinkService should be enabled so Necko can respond to network changes (not offline auto-detection)
https://bugzilla.mozilla.org/show_bug.cgi?id=972262
DNS cache is not flushed/re-initialized when toggling offline/online
fixed in tb30:
https://bugzilla.mozilla.org/show_bug.cgi?id=981513
dns cache grace period error busting too aggressive
https://bugzilla.mozilla.org/show_bug.cgi?id=981447
dns cache too sticky!
fixed in tb30

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