My 2019 Rad mini step thru with 1600 miles "locks up" when i stop pedaling or reduce PAS to zero or turn off controller while pedaling. Everything returns to normal when the bike comes to a complete stop. It feels like the brakes are applied but the brakes are not what is stopping the bike. Its like the motor (or something in drive train) is fine as long as motor is running but grabs when motor torque is removed. When the bike comes to a stop it is like nothing ever happened, until I start going again and stop pedaling. I can ride bike without the power on and it is fine, but when I turn power on it stops like some sort of motor braking is applied. The wheel brakes are not what is stopping the bike. I have searched the internet and forums and can not find anything similar to my problem. Any help would be truly appreciated.