The connection to Team Foundation Server http://...... has been restored
The Build Notification application tries to connect to TFS server to get build definitions and their status and gets an error. This error can also occur if one or more build definitions do not exist on the TFS server. This is because the Build Notification area tries to query TFS server with each build definition instead of fetching the definitions at every attempt.
In the Build Notification application, go to Configure Build Notification. Uncheck all the builds that have been deleted from the TFS server. You may also uncheck the disabled builds to make sure that build.
This should resolve the connection restoration popup in the taskbar.