Hi, I have a similar problem with my laminate and think as others have mentioned it is a humidity thing and perhaps your house is shifting/ heaving some. I think that is my problem as it is a older home and at different times of year I have different doors get sticky on me.
What I have taken to doing is make sure the opened joint is clean and then get a pair of my grippiest sneakers and kind of kick down and forward on the laminate to close up the joint. If the joint is in the middle of your room and you have to shift a number of boards, I will get a few friends and try to time our kicks all at the same time. Sounds stupid but you can generate quite a bit of force this way and has been working for me.
Good luck!
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