ok,
when did it first start happening ? has it been sudden or gradual?
any large potholes or banging the kerb?
could be
bent wheel
tyres should be fitted with the 'dot' opposite the tyre valve , ensure also all balance weights are still on..
any area that has required a huge amount of balance weights??
any unusual tyre wear on the set that came off?
you could jack the car up and spin a wheel and check to see if its true (inside and outside edge)
to be honest is it existed before and after , its either the wheels or suspension components.
maybe swap the front wheels onto the back to see if it still happens.
are your wheel bolts tight?
if you swap wheels around and it still occurs you need to get the geometry checked, anything bad will become apparent very quickly etc track rod end/bent lower arm etc
let us know how you get on
try swapping the wheels front to back first
