Thank you for your replies.
Reset of Cura connect also resets all the analytic data, so we do a reboot of the printer.
Is the video stream problem related to an unstable connection?
I have one display constantly showing the webpage "/print_jobs".
Will printing the printer connection looks very unstable, every 1-5 minutes its is unavailable for 1-3 seconds.
Is this a part of the same problem?