Have taken for service to Vancouver store. My understand from them is that battery plug in port is arcing/overheating, causing bad connection. Battery is okay but RAD solution is to replace battery. Had bike only 17 months, have only ride for 8 months. Battery itself is still good. Not a happy RAD owner, RADCITY 4 has turned into a endless money pit. FYI bike is stored indoors and commuter ridden in good weather.