Be gentle, this is my first post.
We have had trouble with shimmy from warped front rotors more than once now. Everything was great until about 30k miles and than the rotors seemed to be warped. I had them turned and all was fine for a few hundred miles and it came back again. I put some high priced ceramic pads on but they warped anyway. Is it possible the material has soft spots that keep wearing as low spots? Les Schwab says their snow tire change had nothing to do with it but after they switched tires it seems worse.
Any advise is appreciated.

 

replace the rotors