Why an electric wheelchair to accelerate when it was used widely?

An electric wheelchair for the sport of football power uses gel batteries and a DC motor with PWM. The controller is programmed to give a maximum speed of 6 mph am to follow the rules of the game, but after half an hour, the speed of play has risen to more than 6.5 km / h, breaking the rules. The speed of the chair is scheduled to eight miles per hour when 100% but programming does not change during the game. What could be the cause of this drift rate? Edit-This afternoon, I measured the stress of "warm" and was actually lower than the starting point. I thought the tension increases with warming has been a very good suggestion, but with the average production of 15 to 20 amps, and resistance of 0.003 ohms, the battery works just not heating much.

Sometimes, the programming fails. Everything that happens.

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NOVA Cup Holder for Rollator/Wheelchair $11.33 Nova Ortho-Med Cup Holder mounts to the frame and folds-up when not in use or during transport and storage….