I see that too, but it seems more incorrect assembly or operator error. The BBB site only shows one complaint in the last 3 years. It was in regards to contacting support to eventually fund a broken hall sensor wire and a bad hall sensor. I’m not sure how both can be bad at the same time, but there was resolution. I try my all to NOT contact support. I’d rather fix it myself. If I’m going to go through a hassle, it’s going to be to learn how to do it. YouTube has given me the confidence to fix many things. HVAC, water heater, kitchen aid mixer, cotton candy machine, building a chicken coop, all kinds of things. I’m pretty handy.
A bit off topic, but one thing about rize bikes, and other bikes with a bafang middrive that I’m curious about is if the motor (M620) can be user programmed with the display/usb cable.