Assuming you have floor mats, take them out, and assume it won't happen again. If it does, get back to us.
Seriously, the only situation I can think of: if you have i-ActiveSense, had it in cruise control, were below your target speed, and moved out behind an obstruction ... then it would accelerate on its own. Normal behavior.
Two possibilities, the best I can do.
(P.S. Back in my Prius days we were all asking where we could get some of that "sudden acceleration" everyone was talking about ;--)
2017 CX-3 GT, AWD, i-ActiveSense, Ceramic Metallic, Black ... His: Zoom, Zoom!
2016 HR-V EX-L, AWD, Milano Red, Black ... Hers: Putt, Putt.
Last edited by mainemanx; 05-31-2018 at 08:37 PM.