Thank you for the feedback @RobertS77,
The automatic log off is for security reasons, as your account contains sensitive information (Contacts, credit card info, etc.).
After 15 minutes of inactivity you should see an overlay asking if you are still working-- which will stay up for another 15 minutes.
Great feedback about bringing you back to the login screen! I'm going to share that feedback and open this up for voting.
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