If they do not have rotary sanders like a trio or power drive.
Should wood floor feel like it has waves.
Most of the time wood flooring should have occupied space conditions between 30 50 relative humidity to minimize cupping or crowning like you are seeing.
By carlye jones rippling in a wood floor is called chatter if the ripples are less than 1 1 2 inches apart and waves if the ripples are more than 1 1 2 inches apart.
The walls and windows that surround a wood floor are also partly responsible for room echo.
You can limit the.
From the statement you make sometimes it is worse than other times i would guess conditions are not consistent throughout the year.
They need to spend a lot of time on the finish sanding.
The waves can be fixed but floors will need complete rework.
Sound waves bounce between the wood floor and the walls intensifying the effect.
They have a wavy like appearance and you can feel the waves with your hands.
I noticed the waves on hardwood floor probably a month or so after installation.
Either way the result is not.
I have been waiting thinking they might flatten out in time.
They can use a multi disc driver plate.