How can you fix spacing in vinyl plank flooring?




We had vinyl plank flooring installed about 3 years ago and we noticed over a year ago some places it looks like it has shrunk and left gaps between the boards. They never mentioned it would do this but I have talked to others this has happened to and some have used a filler to match the wood to fill in, but I would like to know why this happens. Any ideas?
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Sawdust and wood glue works exactl (for wood)
Wonder if u were able to get vinyl shavings and maybe an appoxiey gule?
https://www.youtube.com/watch?v=9UPGSXa5gws
See If these help.
https://www.doityourself.com/stry/fill-in-gaps-between-poorly-laid-vinyl-plank-flooring
https://thefloorpro.com/community/topics/gaps-appearing-in-installed-lvp.17566/