“The link you followed has expired” when previewing a post

Recently, I believe after switching to WP 5, non admin users are randomly getting the following error when previewing a post:

“The link you followed has expired” . Please try again

I am suspecting this is due to some conflicts with the theme or some plugins. Unfortunately the theme is not supported. I am aware that it would be wise to switch to a supported theme, but in the meanwhile, where should I start investigating? This similar post, points out some trouble with nonces...

Topic nonce Wordpress

Category Web

1
answered at

I get it a few time on my Hostnoc hosting, it happens when you have something running at the back of your WordPress (i.e. cron job or schedule backup up etc), this happens when you put a lot of usage on the server. Make sure you save each and everything before pressing publish.

Furthermore, changed the values in cPanel, in the server, but you can do it in the php.ini file:

upload_max_filesize = 64M post_max_size = 64M max_execution_time = 300

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