Same here! I have been facing this since yesterday on web WhatsApp on Microsoft Edge. Messages in the web app stop syncing with mobile after a while of usage, and on refreshing the page, I am asked to scan and login each time. Happening several times a day and even when I’m continuously using my office desktop.

https://answers.microsoft.com/en-us/windows/forum/all/whatsapp-on-desktop-keeps-logging-out-and-require/22376709-f95b-42b9-b7d3-2b08d2cdf4e7