Looks like most commenters here are Windows users. For Windows users specifically, there is a public bug logged here: https://jira.atlassian.com/browse/HCPUB-660. You can watch that bug for updates.
A new version (1341) was released yesterday. This version has improvements to reconnection. You can find it on the HipChat downloads page. If you are still having issues reconnecting after hibernate or switch networks, please contact email@example.com.
Download and install the hipchat native client. Use it instead of the browser client. It will remember your authentication settings between sessions. When you computer wakes after sleeping or hibernating, it will pick up where it left off. If it crashes, you start it again like any other application instead of having to find the URL and reauthenticate.
And it's way cooler.
As you can see from the comments below, it seems maybe the HipChat native client for Windows isn't doing so well for everyone. After I posted this, I check with some of the staff here that run on Windows and they said the same as everyone here has. Happily for me, I only have to run on Linux, and that native client is doing really well for me.
Response from HipChat:
My name is Stephen George, Customer Insights Manager for HipChat. Thank you so much for taking the time to share your thoughts with us. Customer feedback is our life blood; we're always listening and working hard to deliver the features and experience you need to do your best work.
Over the next few months we're focused on nailing core areas for HipChat including:
We know how heavily you rely on HipChat and we're excited to share everything we have in store. Subscribe to our monthly newsletter to stay up to date on the latest and greatest.
If you have any additional questions or feedback, feel free to reply to this email.
Thank you for taking part in Atlassian's product development process. (yourock)
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 ...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events