I have had my 07 mustang for about 5 months and have had to re calibrate the window three times any help why this is going on would help.

 

You may need a new battery. Are you having problems with the car starting on cold mornings?
According to the manual;
Restoring the Express up functionality (Front windows only)
Under low battery power conditions, Express Up only functionality may
be lost. To reset this function after restoring full battery power, pull the
switch to the Express Up position, hold the switch until the glass
reaches the stall position and continue to hold for 2 seconds. Push the
window switch DOWN and operate the window to the full down position.
Express UP will now be functional. Perform Express UP
re-calibration with door closed only. Calibrating with door open
will cause the window to continuously bounce back.

Here's an online manual;


http://www.autodealertools.com/quick...05/Mustang.pdf

 

car starts fine but its the function part of the window, when you open the door the window will go down a bit to clear the drip rail, three times since i have had the car it hasent gone back up and have had to re calibrate. I dont want to keep doing it.

 

Its either your door open switch that can be verified by dome light operation
or the window motor assembly need to be replaced.
The up down auto logic is contained within the motor assembly.