We found that our hardwood flooring was buckling here and there before closing with our builder. I understand that the buckling may be caused by the humidity change inside the house, but, is this really normal? They have only installed the flooring in about 3 weeks ago, and it already started buckling? 
If this is acceptable, how long should we wait to file our complain? Assuming we will maintain our house temperature and humidity, but the hardwood flooring has no sign of getting back to "Normal".

If this is acceptable, how long should we wait to file our complain? Assuming we will maintain our house temperature and humidity, but the hardwood flooring has no sign of getting back to "Normal".