The June (2023) release of Primo reduced the default session time per login for privacy reasons.
To opt-in to the longer session period (up to seven days),
- sign in as usual if needed

- once signed in, click the button in the top right corner where your name is displayed
- in the menu that opens, select 'My Personal details and settings'

- on the following page, look in the right column and enable 'Automatically extend my session'

- (to make the change stick) click on your name again and 'SIGN OUT' then return to Primo and sign in as usual