oak floor started to lift

An oak floor that has been down for about 3-4 years has juust started to lift . 2 boards in the middle of the room, lifted from there batons, prerventing a door to open. Boards are 6" oak T&G nailed ( through the tongue ) on 3/4 batons which are screwed and plugged to concrete floor Could this prolonged warm weather have caused the shift and what is the best way to remidie this. TYIA
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