Something on your system is terminating the login data. Things like CCleaner or anything that performs functions when waking or at startup could be the cause. This is not happening on my Windows PC when I use sleep or reboot.
I’d prefer we get an answer from Tech Support vs an MVP who has made multiple posts on this forum on this topic the last six months without an actual solution. This has only started for me when I updated Diablo 4 Season 4.
Submit a ticket in then… Blizzard hasn’t posted on this forum since Microsoft took over at the end of January and fired 1900 Activision-Blizzard staff.