Has anyone encountered a similar problem?
Nginx-Helper, Redis and configuration:
PHP7 + SSL: do not purge the cache and you have to use the redis flush
PHP7: everything is fine
HHVM + SSL: everything is fine
yes I have noticed some issues with redis-cache during the previous few weeks.
But at first, make sure Nginx-Helper is properly configured to purge the redis cache and not the fastcgi-cache, and purge enabled.
I managed to solve the problem. It turned out that I forgot to change the wordpress settings form http to https.