Almost any lease gives you the right to do so. You can use repairs as an excuse if you need to.
Interesting point, though. We've been in our current house for 10 years, it's 25 years old. The polyurethane was sanded down and refinished around 1990. It has not separated or cracked at all, and the boards have separated in only one place -- at a threshold between two rooms.
Before that, we lived in our old house from 1981 to 1994, and I never had separation between any boards. Of course, that was a waxed floor, so I had to be careful and renew the wax frequently to prevent stains (and I wasn't always careful, esp. in the kitchen, it got away from me in a couple of places. Which is why I prefer the poly.)
Both houses were not spec houses but custom (we built the first one ourselves) with oversized joists and short spacing between the joists, which probably has something to do with it.