I had a Gen3 Prius and I believe the whole problem was overhyped because so few people were aware of ABS action and because Toyota were having different PR problems in USA. A slight difference in braking requirement to one or more wheel when a different road surface is crossed causes a momentary activation of ABS. So what? It's what the car is designed to do, though I would rather it re-acted accurately. Because I have experienced it in my CT I will suggest, when the car is serviced, that it is checked. If it can't be adjusted, I'm happy that ABS cuts in sooner rather than too late.