Images are gone after a while

Hi,
I have a pretty large website (www.knrm.nl) where I activated the plugin PCE pro. But I noticed that after a while, the images of some items are gone. Then it looks like this: screenshot.webjongens.nl/5zudkjpo, where it should look more like this: screenshot.webjongens.nl/BluQebJW

I tried many thing, changing for example cache time, more or less minutes then in Global configuration, turned off Redis and returned to Default cache,... But problems seem to retun all the time.

Do you have any suggestions? I would love to keep on using the plugin, as it speeds up the website very much!

Regards, Carst

Please log in to see the response. Attention: You need a valid subscription to activate an account.