A way out crashes keeps crashing on the same scene

@SmitIsBae Can you try going through our Basic connection steps, and our steps based on your platform?  

• PC Advanced connection steps  
• Xbox Advanced Connection Steps  
• PlayStation Advanced connection step  

Thank you for getting back to me, we have tried all this expect the open ports since we don't really fully understand how to do it. And got told by my internet provider its risky to do. We tried something aswell, When she hosts i get disconnected on the scene and when i host she gets disconnected, It worked fine with all the other scenes and gameplay, So we are really confused with why only this scene. We get as far as going into the road tunel and then one of us disconnects depends on who is hosting. Both our pc's has required pc specs and we play a lot of other games together and played this together before with no problems. 
Thanks for your help and sorry about my English. 

@SmitIsBae   To check can you try setting up a static IP for the consoles to see if you can stay connected?

I am not sure how to do that, i dont got access to my router.

Thank you for all your assistance and yes we can swap back to our characters we played. For the scene i had to play Vincent and she had to play leo for it to work.