73 Duster front disc brakes dragging when hot

I have 2 ideas for you, And they both depend on the brakes returning to normal by themselves, when they cool off.
-A) The fluid is not returning to the M/C. If the hoses ( you said both sides are doing this) are internally bad it prevents the fluid from returning through the compensating port, to relieve the pressure. A second possibility and more likely(its hard for me to accept that both hoses went at the same time) is that a) the pushrod between the pedal and the M/C is far enough out that the same thing is happening; the fluid is not returning, or b) the brake pedal itself is not parking at the top of its stroke, or c) the compensating port is plugged or severely restricted.
-B) the pads are too thick, or incorrectly installed such that even with the pistons fully retracted, theres just barely enough room to straddle the rotor.
-C) water in the caliper. When it heats up to boil, it flashes to steam and forces the pistons out against the pads, and into the rotor.This is usually not a problem until the caliper gets very hot. Usually requiring a lot of heat, in a short period of time.And would probably only manifest if the fluid was not returning as in A above.
--My money is on A-c, with maybe a touch of C
Time to get busy.Test the compensating port before doing anything else.