Base URL and Cache issue

Hello everyone !

I use Contao 3.5.34.

Sometimes I experience a weird issue on my website www.bioweb.fr.

In the html generated in cache, the baseURL contains the server IP instead of the domain name.

See the example in attachement.

Note that when I'm logged in the BE and visit the website, everything works as expected, assets urls are correct.

Also, a manual purge in the BE seems to fix it but temporarily, until the next cache invalidation I suppose.

So it seems that it breaks when the cache is automatically invalidated (via cronjob?).

I'm not able to reproduce the issue manually and I can't figure out what's happening.

I'm stuck with that, do you have any idea?