Yes, this problem is very annoying. However, I can confirm that the 'tap' works. My sparky told me it happens in some cars and may eventually need to have the motor replaced, or it could be that the window gets dirty and causes it to stick. I have noticed that my windows have been dirty evertime it happens - may just be coincidence?????
To open or close...... simultaneously, hold the relevent window switch (up or down) and give the door a 'fonzie' on the inside door panel - has worked everytime for me so far when I tap the top of the door panel.
For those who are too young to know who fonzie is, forgive this old bastard and, just 'give the door a slight thump with your palm'
Cheers,
Vic