What happens, when it is my turn?

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• The Queue-it queue page shows it is my turn, but I can only see a blank page and got redirected to the waiting room again. What has happened?
• Why do I end up in the queue over and over again?
• How is it possible that my expected time of arrival to the website changes?
• Do I lose my place in line if my mobile phone is in sleep mode?
• How do I transfer my queue position from one device to another?