u/spirit_desire

I have 5/16” solid wood tongue and groove flooring nailed down, running diagonal in a hall. It’s been fine for years but after an abnormally hot summer it has buckled and lifted where indicated (hard to capture with camera).

Because this area meets two door thresholds there is not an easy solution for creating extra time on for expansion. What are my options here? Not a pro, fairly competent home DIYer.