Flaps auto retracted for load relief.
The only auto retract on the A320 is from CONFIG 1+F (slats + 1st stage) into CONFIG 1 (slats only) and generally occurs in turbulence after a max weight take off. Once you go beyond that stage you will be explaining the exceedance, and possibly damage as there is no further protection.
At 5nm from the threshold, any sane A320 crew would want to would want to be in at least flaps 2 with the gear down and a sensible speed, most would be more comfortable with flaps 3. Doing 250 kts the aircraft should be clean and even with speed brakes and configuring as soon as the speed fell below each limit there is no way you could be stable at 1000' even if you went for a flaps 3 landing. You might get it onto the runway and stopped if it was long enough but you could kiss goodbye to your job and probably your licence as well.