If you mean you have to quit and restart HipChat, see the question How do I make HipChat automatically reconnect after my computer resumes from standby? Every time I resume my computer, I must log out of hipchat and log back in. Also, how to have HipChat remember my login information? You're not the only one, and this isn't really an answer, i know.
I have the same issue. It appears to have changed in the last couple of updates of the Windows client. Prior to that, I could dock/un-dock, change wired/wireless connections sans issues.
I don't logout, I right click on the tray icon and pick "quit". Starting it back up resolves the issue, so there is a workaround. Unfortunately, I usually don't realize that it is not connecting until I get a "sent you a message but you're offline" email.
I am running Win 7 Pro sp. 1
All good things come to an end - thanks to all our customers and partners who have been along the Hipchat and Stride journey with us. As of Feb 15th 2019, Hipchat Cloud and Stride have reached ...
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