the_post() after new wp_query()

I had no idea how to name this post, I’ll try to explain my problem as best as possible.

I’m on a single post’s page. I want to show the following sequence of information.

[ Title ]
[ Content ]
[ Related posts ]
[ Next & Previous links ]
[ Comments ]

The problem I have is I am running a new wp_query to retrieve related posts based on certain criterias. After running a new wp_query and while(have_posts())in [Related posts], the last retrieved post will be used for the Next & Previous links and the Comments.

I have tried adding the_post() in between but it does not work. How does one goes around such a scenario?