Hi team, this is my third attempt to get to the bottom of this problem. It is happening on all sites in which I am asking Hummingbird and/or Hummingbird Pro to do caching.
After a few days, the site is displaying its theme rather than child theme, which means colours for headings are wrong and it doesn't show any new posts, etc.
If I manually click the Clear Cache button, everything is fine.
After my first chat with support, I was asked to contact you next time it was happening, so you could investigate.
For the second chat with support, your person said to select Automatic File Change Detection. This works IF you are updating your site every day or two. Sadly, on some sites, my clients only go in every few days or even few weeks, which means their sites look terrible until they notice it and manually click Clear Cache.
My third attempt to contact support is now. I was waiting for Chat Support for 30 minutes but need to get to an appointment, so I am hoping someone senior can take a close interest in this and possibly look at some logs or get access to dig deeper.
I have stopped recommending Hummingbird to my clients until we can sort this out because there is something going wrong. My sites use the Divi Theme which is a widely supported and popular them.
I am happy to provide as much access as you need.