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What is the possible cause and fix for the alert "Your request could not be completed because you have been signed out. "?
Thanks in advance
This is caused by the session timeout which is configured in OSGI. Check  for more details. Increase the timeout to resolve the issue.
How frequently you are getting this alert? If you would have inactive for longer duration you will get this alert as the session will not be valid.
Also have you made any changes to Sling Authentication Service ?
Some article here: