Let us know how you're testing and we'll gladly help investigate further.What do you mean by 'leave'? If you're closing your browser, that's likely the expected behavior. Many browsers, nowadays, will clear session and cookie data when you completely close/quit the browser. In that case, your session would be lost and you would need to login.
If that's not the case, let us know how you're testing so we can understand more. Also, can you tell us if this happens only when you login with a social network or if it happens with all Joomla authentications? If it's with all authentications, there is likely little we can do as the issue would be in Joomla itself (or some other extension).
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