Every time you log in to LinkedIn from another device or another location, it is possible that the session stays active. It is a good thing to check whether you are still logged in some sessions from maybe months ago.
LinkedIn has a nice feature to see where you are still Logged In and make you log out automatically.
Among the shown sessions you will also find your mobile apps. Leave them signed in or you will have to sign in again on them.
Tip: Watch the video full screen!
Personal Note: I check this on a weekly basis.
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