I saw in coroland forum that some people had interference from cell phones near the steering column. Could it be your problem? I personally have no problems with 10 Prius steering. I's pretty good for electric PS.
so would you say this is a common issue and not really a problem? and just something im going to have to deal with? ive taken it to the dealer and they tell me its not a problem but for me it is. it is reassuring to know it hasnt just happened to me