Hi Olga,
Yes, in Theme Options > WooCommerce > Shop > Shop filters all options are disabled
I found the issue,
We have a cron sync script which runs every hour, in my script I am using variable name $filename and the same variable name is used in the Rocket Ajax filter plugin.
foreach (glob($BeRocket_AAPF->info[‘plugin_dir’] . “/template_styles/paid/*.php”) as $filename)
Issue fixed, sorry for the trouble …..
Thank You again