The humidity levels in homes play an important part in how well your wood floors keep. The poly is not expanding and contracting as much as the wood and in extreme conditions of large swings in humidity or temperature the poly bond can severe in some areas of the floor. Even slightly and adding on a lot of traffic will break it up even faster.
It sounds to me that the humidity levels need to be fixed first. If you are renting you should contact the landlord and let them know their flooring is getting jacked up because of this. As a renter there is little you can do. The landlord might ask you to use a humidifier that he installs or to keep the house within a temperature range. Everything else is out of your hands.
I would almost guess since you are asking how to clean it - the poly is past the point of return or it was never installed correctly. Basically you should be able to sweep and mop at will with poly. Just no hot water and no chemicals. If the floor is sticky/tacky the poly has started to break down. Again this could have to do with the humidity/temp issues.
The science behind it is the equilibrium moisture content. You may actually be breaking this equilibrium by doing too much to the floor. I can't say for sure. But if you are introducing moisture/wax/whatever to your floor then your floor has to get rid of the said moisture to get to it's balanced level. When it has to continuously do this its properties change and it dries out even faster (initially). You don't hydrate wood with wax or products, wood will hydrate itself. Leave it alone. Give it a good temperature and humidity level. Sweep your floors. Light mop once a week. Give it two months. If they still look dry then the landlord needs to step in to fix.