Sent this email to Rad on7/10, no response. Maybe I can get help here.

I own two rad runner plus bikes, we haven?t used often. We have begun to use them more. One has 70 miles and the other 30 miles.  I have always heard a clanking noise when pedaling on both bikes while in pedal assist modes. I push the pedal and it feels like a free flow then clank and assist kicks in. I noticed it more on a 10 mile ride this past weekend, because others around me asked why it was doing that. So with each time I pedal, this happens. The bikes were put together by a professional bike repair shop. Now I?m realizing I don?t think this is normal. What do I adjust or do to fix the problem?