Welcome in mate

There will be nothing wrong with your switch, the problem will be that there is loss of contact in the terminal
What to do is remove the switch and clean the inside of the Bullet conectors inside the switch with a small file and close them up a tad so that they make a good conection with the loom side of the conection which will also need the same treatment.
That should sort you issues out and get the windows working again

Regards
Ian