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Hello,
Are there any PHP errors in your web server PHP error logs? You can ask your hosting support about this.
Thanks for the pointer. I found the following and disabled the IONOS Performance plugin and it works ok now.
[01-Sep-2023 14:09:29 UTC] PHP Warning: Undefined array key “host” in ……./wp-content/plugins/ionos-performance/vendor/ionos/performance-feature-caching/inc/Caching.php on line 301