For the last week, my son's Pixel 5 has reached it's time limit first thing in the morning. It's been on charge overnight, but not being used. the Norton activites display is 0 hours, and then suddenly goes to 10.5 (it's currently 9.30 in the morning, so the phone can't have been used for 10+ hours.
I see a few posts on here with Norton saying that it's fixed in the latest release. There are no updates available in the Play Store, so it's still an issue.