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@CrazyJames
Posture and pedalling technique, when you're sprinting you should be pushing yourself back into the bike, pulling your hips forward with your abdominal muscles, not pulling the bike up towards you (which is what it sounds like you are doing at the moment). Using your hips as the leverage point if your seated, (and at a high cadence) you want to be pushing your hips back into the saddle and using your upper body/arms to minimize side to side wobble, to give you a solid base to pedal from and to keep the power on.
You also want to concentrate on keeping your power application even througout the pedal stroke, and the high cadence work hippy suggests will no doubt help that a lot, as it will help you to learn to relax through the pedal motion and spin smoothly instead of mash your way through the cranks (not saying that is what you do at the moment just saying thats an effective way to prevent it).