Missing submissions

Hi
A client uses the actual pro version of forms (I guess):
https://prnt.sc/vwVPBIeNloKO

For a event there are now registrations missing in the database for a certain timeframe (approx. 6 hours). I have seen in the user activities that Joomla and BAForms were updated during this period (mysites.guru).

Could it be that this event is responsible? The mails (client/admin) were sent normally, but no entries were made in the database during this time.

Or do you have another guess? And of course the option 'Save submissions in DB' was always on.

Thanks in advance
Roger

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