We purchased Ikea Tundra Laminate flooring and are having trouble having the pieces connect on the longer sides.  Once we do get them connected and move onto the next row (3rd row) the first will come apart from the 2nd, then eventually most of it will come undone.  We have checked that all the boards are connected perfectly even in terms of the other part that needs to be connected by hammering it in.  Any advice?