Wheel binding I was starting to see this more and more while the racing was going on , I found out that this was caused by race track loose fluff cause by the cars going over the track. For a little car they require a lot of maintenance to keep running to its best.
As you can see the fluff around the shaft, this is only after a couple of hours, the wheels also show a lot of dust all this requires getting rid of, t allow te car to fully function.
Tools required for the job are a good brush and a pair of tweezers and a air puffer if you have one, this will require to be done often.