Power Surge?

[rpwbike]

Got my RadCity on May 12th, have put 45 miles on it so far.  Twice now, when I am cruising along (about 10 mph, steady pedaling in 3rd gear, no PAS), I will get a half second or so power surge from the motor that pushes me forward.  After the first time, I thought maybe I had somehow engaged the throttle, so when it happened the second time, my right hand was for sure not touching the throttle..........

Any ideas on the cause of this 'surge'?

[carlossg]

I have experienced a similar issue with my RadCity (about 200 miles in it so far).  Also, when reaching about 14-15 MPH, the surge becomes intermittent (ebb and flow), which  is very frustrating.  Just put in a request for assistance to Rad, and will report back if I get a response!