I laid my LVP in the kitchen/living room last fall. Starting about 2 months ago there are 3 rows of planks that are slowly moving. I taped them back into alignment, and over the course of the last month they have moved again, by about a 1/2 inch in a month. The 3 rows move together. And when I tape them, they move back together. Since I can tape them back, I don’t think anything at the edge is pushing them. Any ideas??
They are up against a wall and door at one end (with a 1/4 inch expansion gap). And the other end is open because I plan on building a short wall there later.