How to fix a spongy floor (laminate ), do I need to re-do the whole floor, or is there any way to just fix the spongy part. Thanks a lot

You might want to explain better what you mean by "spongy".

Are we talking a situation where the laminate has warped or become UNbonded in certain areas where it remains bonded in others, leaving what appears to be a "springy" area? Is this a case where the lamnated material has experienced a material failure? What type of material is this exactly.