Glad I could help 🙂
Well as the windows are operating normally, I think we can rule out the regulators, motors and fuses. I'm wondering if there's an issue with the drivers side switch. My advice would be to try and reprogram them before you replace them. Here's info I've found on line for the a3 8p:
"Window programing.
Are you experiencing issues with the auto up/down function? Well, you may just need to reinitialize the window switch or each panel. Every time the car battery is removed, the window switches are required to be reprogrammed in order to have the auto-roll down function initiated. To program the switches, do the following:
Press the down button for 10 seconds.
Press the up button for 10 seconds."
If that doesn't work then it might be worth removing the drivers side switch and cleaning the connectors.
Hope I've helped.
Cheers
Steve