2019 RadCity with 2600 miles. Started noticing this awhile back on Wife’s bike but thought it was bumps reverberating through the wooden box mounted on the rear while riding. It’s not bumps. I have noticed both bikes have always made a slight thud when running the motor while leaning on the kickstand during the last two seconds before the wheel stops. You don’t hear these while riding, only the occasional loud thud from one bike as it’s slowing way down. It does not do the loud thud every time, maybe every 5th test from either a pedal start or throttle start then let it wind down to a stop. It sounds like a medium slap on a desk top when it happens. There is zero power going to the motor when it happens. The wheel rolls freely mechanically. Anyone seen this problem on a rear hub motor?