Hi and welcome. Congratulations on the new Adventurer.
We've had a LOT of complaints of this happening on new Winnebago Forza diesel RVs. In fact, so many that there was a recall and the company came up with a fix that is pretty unconventional - they install a separate secondary latch to each door.
There are a lot of posts about how to adjust those latches and things people do to improve the holding. My 2017 Adventurer has never had any problems with this. So, I don't have a lot of suggestions.
Here is a link to a helpful thread here on the topic with a Vista and the Adventurer and Vista are closely related.
https://www.winnieowners.com/forums/...pe-362221.html
Also, here's a photo of how this was solved on a Forza - but the Forza latches are different from the Adventurer.