After adding the command "php bin/magento indexer:reindex " as a cron job which runs every minute my Page Cache gets invalidated every minute. Anyone else had this issue / found a way to correct it?
You should not add any reindexing to the cron schedule.
The proper cron schedule: https://mage2.pro/t/32
How can we get the Cache to update on its own through cron or some other service?