In August I had engineered floors installed over cement (radient heat). The floor was a floating floor with a cushion installed between the cement and the flooring. Recently I've noticed that the planks have separated in 2 or 3 locations slightly. It appears that they have separated the toung and groove. The floors were unfinished and had a stain and sealer installed after they were installed. Is this common? Can the spacings be fixed?

It sounds like they were not glued in all connections... OR
New type engineered floors click togather and should not separate unless
Not done properly

I agree they should not shrink
It may change with the seasons
All types of wood products should aclamate to the homes humidity 1- 3 days
BAM