Mobile service was able to feel the shudder after taking the car for a drive on a highway near my work. Mobile service also told me that maybe the service center was not ale to accelerate fast enough due to the service center being in a busy traffic area. If its still under warranty then yes I dont think you have choice unless you just deal with the shudder. I have only had the parts replaced once so far and I do not feel it anymore. Hopefully it does not come back as my warranty has expired now. If you can book mobile service try that also.