yes that is most likely what happened. A change of the nameservers with authority for your zone for example or updates of DNSEC keys would trigger that too, i t

yes that is most likely what happened. A change of the nameservers with authority for your zone for example or updates of DNSEC keys would trigger that too, i think. But most commonly it probably happens when the domain gets a renewed registration period or the contact details for some person changed. btw here are the dates referred in whois for your domain: Updated Date: 2020-02-24T20:32:34Z Creation Date: 2015-06-09T15:34:37Z Registry Expiry Date: 2021-06-09T15:34:37Z looks like a change has been done even more recently.