Many people use the Chrome app The Great Suspender to suspend Chrome Tabs after a period of inactivity. This helps prevent Chrome memory leaks from crashing the system over time.
If you have started a new Sketch and have not saved it when the Chrome Tab is suspended, your Sketch will be lost when you resume. Similarly, any unsaved changes will be lost during a tab suspend.
This illustrates the importance of saving your work regularly.
As an immediate workaround to prevent The Great Suspender from losing your unsaved work, we recommend that you 'whitelist' your LINQ URL ([myorganisationname].linq.it):