Brake Master Cylinder problems of the 2017 Toyota RAV4

Last spring had $700. 00 brake job on my daughters car at Toyota dealer we have delt with for years. I happen to drive it one day and found brakes spongy and went within one inch of floor to stop. Just drove again and same problem !. Is this a design problem with master cylinder !.

I have had this car in several times for brake noises and rotated warping. Currently the car has 35,xxx. Every 5-7k the rotars or pads are replaced. There is usually a noise that is associated with this and a duplicate video was found on youtube and turned out to be a master cylinder and was advised that it is not that but I have second thoughts. Brakes are a major part of the vehicle and there have been several times I thought about towing the vehicle to the dealer. But they claim that the noises are normal and are just the pads shifting, I have had my share far of cars and driven many different brands and never had this issue even with my prior Toyota�s. Second complaint is in regards to my locks. There are times the locks on the vehicle will not lock or constantly makes noise while trying to lock/unlock and the dealer claims they can not reproduce the noise but the second I step in the car it makes the noise.