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We have laminate flooring running from the hallway, through the kitchen and into the family room in one continuous run, a single plank in the middle has dropped slightly at one end - the short end - due to what i can only imagine being the underlay wearing out or something, is there a way of pulling it back up and say filling under it to remove the void without taking half of the floor up?
1. Drill a small hole.
2. Squirt some expanding foam in.
3. Hope for the best.
4. Start pricing up new flooring as there's foam and random bulges everywhere now.
5. Fill the small hole you drilled with some colour matching filler.
(IANA-flooring-expert)
On a more serious note, I have seen but not used this stuff:
I'm considering it for a small area under out LVT when there's a very slight transition between 2 heights and therefore it flexes a bit when you stand directly on that bit.
^^^ That's what I was going to suggest. However, I had a similar issue recently with some loose tiles in a bathroom – I considered using that stuff so I didn't have the hassle of trying to lift them. However, I decided to do it properly, gouged out all the grouting and carefully lifted the tiles. I was relatively happy doing this as I had spares if any broke (just the one did in the end). I was glad I did it as lifting them revealed the reason for the loose tiles – water had been very slowly seeping down from around the shower screen and the dampness had loosened the adhesive. It was a much bigger job than I originally expected, but hopefully I have fixed the leak before it became a real problem. I thought I'd mention it as there may be another (more serious) reason for your laminate moving.