Gymax детский электромобиль UTV 24V с мощным двигателем 4 x 100W и дистанционным управлением

We have had this car almost a year (sat in storage for 6 months due to winter and moving) and we just brought it out for the kids. After about 15 minutes, my 4 year olds smelt something and said we need to call the firetruck it is smoking!!! I thought they were playing games but the back right wheel was indeed smoking and smelt like it was burning the plastic. One was driving while the other was chasing so it wasn't too much weight. The heat was only 86 and not blazing hot. It had charged overnight prior to being used and did not smell at all. I have no idea what could have caused this but it has been disconnected from the battery and no longer being used. So disappointed that it didn't even last a full year. (with half of it being stored)