browser session expired = unable to complete event form
thank you for your answer.
Yes I am using &quot;WP Cleaner URL's&quot;:
-the starting page seen in civicrm-admin is: /event/info/?reset=1&amp;id=2
page1= http://migrationccb.esy.es/2020/08/03/la-6eme-edition-des-vallees-breuilletoise-se-prepare/?civiwp=CiviCRM&amp;q=civicrm%2Fevent%2Fregister&amp;cid=0&amp;reset=1&amp;id=2
page2= http://migrationccb.esy.es/2020/08/03/la-6eme-edition-des-vallees-breuilletoise-se-prepare/?civiwp=CiviCRM&amp;q=civicrm%2Fevent%2Fregister&amp;_qf_Confirm_display=true&amp;qfKey=4e151fc03d552da26b4ccef7fa052d83_8032
page3= http://migrationccb.esy.es/2020/08/03/la-6eme-edition-des-vallees-breuilletoise-se-prepare/?civiwp=CiviCRM&amp;q=civicrm%2Fevent%2Fregister&amp;_qf_ThankYou_display=true&amp;qfKey=4e151fc03d552da26b4ccef7fa052d83_8032
The website is hosting by Hostinger that advice to activate LiteSpeed from his admin-page: it is LiteSpeed Cache 3.3 with defaut settings.
As a first step I decided now to

un-activate &quot;Mettre en cache les utilisateurs connectés&quot;
un-activate &quot;Server stale&quot;
set &quot;shedule purge time&quot; at 00:01

Thank you for suggestions