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It seems odd that a problem which occurs under light braking could be wheels or tyre related but I'm no expert. I'm also surprised that having fitted new discs they need straightening with a lathe. Assuming you don't do stupid things like drive along with your foot resting on the brake or sit at lights with your foot on the brake after very heavy braking, it could feasibly be that the car is activating the brakes in error whilst you are just driving along and they are overheating. Go for a normal drive for 20 mins without braking hard and then see if your discs are hot.
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