As per Spooler, Zs are prone to tramlining (following ruts in the road). It's a problem that is common to all cars with wide tires. Being a light car just makes things worse. But that doesn't mean you don't have a problem. I'd first check inflation (as per IAmTheStig). If that doesn't make things better, get the alignment (front and back) checked. If everything checks out, learn to accept it.
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