After about 800 miles on my RadCity ebike I noticed a clicking sound that varied with the wheel rotation.  I couldn't trace it to anything specific like the derailleur or something rubbing on the wheels or fender but tightening the spokes eliminated the clicking sound. 

I have a loud sound from rear gear / hub assembly motor on a RadCity 4 commuter bike.   At first I though it was the brakes but a bike mechanic said it's my rear motor drive and needs to be replaced.  The bike is less than 3 months old
I recorded the sound -  see attached m4a media file.   Any ideas ?

I have not heard anything back from RAD power bikes after a week    

My month old Radcity 4 commuter bike needed a brake adjustment, the rear brakes squeaked from the start but I thought it was part of the "bedding in" process but it kept getting worse.  I tried the adjustments in the guide -
https://radpowerbikes.zendesk.com/hc/en-us/articles/115004786874-Brake-Adjustment-Guide

No adjustments improved the rear brakes.   I then decided to remove and inspect the caliper brake assembly but it's now worse, un-ridable.  I noticed the mounting bolts had a series of washers, five (5) on each bolt, total of 10.  Some of washers were next to the screw head and some below the caliper assembly but above the frame.    It looks very jerry rigged !   Has anyone else encountered this?
anyone have a diagram or photo on the sequence of the five washers that surround the bolt?

I have messaged the Rad Power bikes Help center but so far no response.  I understand it may take a couple of days.

Any response appreciated.    ..... I think I will have to go to a local bike shop