unwanted cache_page flush for no reason On my drupal 6 site, from time to time, for no obvious reason, all caches gets cleared. Native caching is enabled (normal caching mode, minimum lifetime 1 day). Cron is not setup to run automaticaly. No rules are created regarding flushing of cache. In meantime I do not do any website manipulation like editing content, editing taxonomy or installing new modules.
What I can see in recent log entries is that users keep logging in and out, users make orders (ubercart 6) and several not found errors probably caused by bots.
What can trigger such automatic/unwanted cache clearing, what logs should I check or how to fix that? Thank you.
you could place a watchdog('cache_clear_backtrace', print_r(debug_backtrace(),1); in that cache_clear_all() function to see from the log why/ where that happens.