Sometimes after longer big feeds E will do huge spews. I'm talking projectile spew, massive projectile spew, sometimes comes out his nose spew!! Usually it's when I try to burp him at the end, but it also happens after I've burped him and sometimes even when he's still latched!! Urgh!! He isn't bothered by it at all! In fact he looks really happy and peaceful after it. I never have a warning sign that it's going to happen - he isn't fussing at all!

Why is this happening? It's such a waste of a feed and milk!!! Should I be unlatching him and burping him more often?
Anyone have any advice?