18 SHO - defroster not staying on

[Taurus921]

I always keep my heat on defrost mode as I don’t like the hot air blowing in my face from the vents. Until recently, whenever I would turn my car off after having it in defrost mode, it would remain in defrost mode when I turned it back on.

In the last week or so, every time I get in the car I have to physically push the defrost button – it doesn’t default back to where it was when I got out.

Anyone know how to remedy this?

Thank you