[The HACK]

Then we can probably rule out Hill Start Assist. Hill start assist MAY force the pad into contact with the hot rotor when you park in the paddocks, especially if there's an incline as you shut down the car with foot on the brakes and car in gear. It will result in heat transfer from pad to caliper piston to fluid, slowly boiling the fluid inside the calipers leading to the "soft pedal" fluid fade.

The brake drying feature CAN result in unnecessary heat built up, but unlikely. The brake drying feature barely brushes the brakes every few seconds to sweep water off of the rotors. It's on only if you leave both your headlights on auto and wiper on auto (right stalk up one position). It does drag the brakes hard enough to feel if you're on top end track pads and r-comps, but in the course of a 20-25 min session it SHOULDN'T generate enough heat to fade brakes. But if you're feeling pad fade, THIS, of the two features, would cause that.

Check and see if you have your right hand stalk up one and on auto. If you do, disable for track use, and disable automatic headlights. This will deactivate the brake drying feature (since both off would indicate sunny and dry condition).

And if you're still fading, then the culprit are the brake pads or lack of cooling for the speed you're carrying.