Sorry for your troubles - There could be several reasons (i.e. temporary account issue, a hanging process, expired token). When this issue occurred did you re-boot your machine to make sure any possible hanging process is going to be restarted?
Could you send me [upawlik@adobe.com] the Team Project Local Hub logs for the timeframe you were disconnected?
Team Project log location:
(Mac OS) : ~/Library/Preferences/Adobe/Team Projects Local Hub/2.0/logs
(Windows): C:\Users\[user]\AppData\Roaming\Adobe\Team Projects Local Hub\2.0\logs
The Easiest way to access the log location:
On Mac: Open the 'Go to folder...' Finder menu per Cmd+Shift+G and paste following string into the text field: ~/Library/Preferences/Adobe/Team Projects Local Hub/2.0/logs
On Windows: Paste the string into the file explorer address bar: %AppData%\Adobe\Team Projects Local Hub\2.0\logs
Best,
Udo