var/cache issues, please help

[884483048]

Permissions and owner of var/cache/* are correct. PS 1.7.6.1, PHP7.2/Apache 2.4

Often got white screen and this error in httpd.log when hit "Clean Cache" button at website backend. Refreshing the page will help to continue to green "Cache cleared successfully" message. Unable to find what causing this. Prestashop debug mode showing no errors. Please help.

[proxy_fcgi:error] [client xx.xx.xx.xx:56464] AH01071: Got error 'PHP message: PHP Fatal error:  require(): Failed opening required '/var/public_html/var/cache/dev/Containerxxxxxxx/getPrestashop_Core_Admin_PagePreferenceInterfaceService.php' (include_path='/var/public_html/vendor/pear/pear_exception:/var/public_html/vendor/pear/console_getopt:/var/public_html/vendor/pear/pear-core-minimal/src:/var/public_html/vendor/pear/archive_tar:.:/usr/local/share/pear') in /var/public_html/var/cache/dev/Containerxxxxxxx/appDevDebugProjectContainer.php on line 1708\nPHP message: PHP Fatal error:  require(): Failed opening required '/var/public_html/data/var/cache/dev/Containerxxxxxxx/getDebug_FileLinkFormatter_UrlFormatService.php' (include_path='/var/public_html/vendor/pear/pear_exception: /var/public_html/vendor/pear/console_getopt: /var/public_html/vendor/pear/pear-core-minimal/src:/var/public_html/vendor/pear/archive_tar:.:/usr/local/share/pear') in /var/public_html/var/cache/dev/Containerxxxxxxx/appDevDebugProjectContainer.php on line 1708\n', referer: https://mywebsite.com//adminxxxxxxxxxx/index.php/configure/advanced/performance/?_token=xxxxxxxxxxxxxxxxxxxxxxxx

Edited November 28, 2019 by 884483048 (see edit history)

[884483048]

This error seems disappear in "normal" shop mode if I change php 7.2 to php 7.3 (php modules set is absolutely the same) but if I enable debug mode it appear again.

Any suggestions?

Edited November 28, 2019 by 884483048 (see edit history)