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@twd Although all plugins and themes are up to date I would still start by looking at them to see if they are causing the issue. Get the Health Check & Troubleshooting Plugin here:
Using this plugin will avoid changes to your site that can be seen by the public. The plugin helps to look for plugin and theme conflicts without affecting the live site.
Follow these steps:
Install and activate the Health Check & Troubleshooting plugin.
Go to Tools → Site Health → Troubleshooting (tab) and click Enable troubleshooting mode. The page will refresh.
At the top of the page, click on the toggle arrow beside ‘Available Themes’ and make sure a default WordPress theme is activated (such as Twenty Twenty, Twenty Twenty-One, or the Storefront Theme for WooCommerce stores.) Then, see if the issue persists.
If it doesn’t, your theme is causing the issue. You can: a) change your theme; b) contact the author of the theme and ask them to fix it.
If the issue does persist, proceed to the next step.
Expand the ‘Available plugins’ section. You’ll see all plugins have been deactivated. Now activate one of the plugins (it can be any of the plugins from the list, but you can start from the top of the list or with the plugins you most suspect.) Test if the issue still exists.
Reactivate the next plugin, and then check again if the issue returns. Eventually, this will tell you which plugin is causing the error because the issue will return when you reactivate a particular plugin.
Once you are done testing, you can click Disable Troubleshooting Mode to return things to normal.
Go to Plugins → Installed Plugins and deactivate the plugin(s) you determined to be the source of the issue. You can leave the plugin deactivated and contact the plugin’s developer to fix the problem.