Please open the 'Extensions' app and ensure you don't have any extensions enabled other than the three built-in extensions that ship with Ubuntu. If the problem still happens after that then please follow these instructions to check for crashes: https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment
Please open the 'Extensions' app and ensure you don't have any extensions enabled other than the three built-in extensions that ship with Ubuntu. If the problem still happens after that then please follow these instructions to check for crashes: https:/ /wiki.ubuntu. com/Bugs/ Responses# Missing_ a_crash_ report_ or_having_ a_.crash_ attachment