have searched and can't find anything like this. Went for morning ride with wife and about half way thru I look back and she's fallen way behind even when trying to catch up using throttle or higher level PAS. seems she is limited to 12.5 mph, unless totally self powered herself. In testing it I can see where it will take off like normal and seem to go, but then it slows itself down maxing out at 12.5 almost like it hits a governor. Any ideas? Had about 18 month and no issues except initially had to replace the digital display and wiring as the motor stopped completely engaging.  Thanks in advance.