Definatly cells I would think. My Ib4200s are a year old now and definatley showing signs of fatigue, If i don't peak them for the first minute of the race there is no punch at all and then when it starts the discharge cycle the punch starts to come back by about the second minute it is back to normal. I also had an issue where off the line the car would pull off an then cut out but this was rectified by changing to nimh mode.
Got some Lipos over christmas and my car is now wheelying off the line and all the way down the straight so it obviously isn't a problem with my speedo/motor.
Try and borrow someone elses cells and I am sure you will see a massive difference.
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