The driver's window switch one-touch was erratic so I've just replaced the unit. Seems not an uncommon problem but thankfully it is an easy fix.

 

Got a replacement switch from Amazon for €20 which has the added benefit of the the Chrome detailing that mine was lacking, although I had added some AliExpress chrome pieces to the old one.

 

Prize out the window switch trim starting with trim removal tools along the long edge, working your way back to the short edge. Tilt up and out to access wiring.

 

Disconnect both electric switches for mirror and windows, there isn't a huge amount of cable so access is a bit awkward. 

 

With the trim removed the switch unit is held in by 6 small tabs on its edges. Use a fork shaped trim removal tool between the switch and the trim and work your way around. With the 6 times released it's simply slide out.

 

At this point I tested the Amazon switch before installation by hooking it up, everything works fine, the only thing is the the rear window lock doesn't light up amber. It just goes on or off.

 

Then popped it back into its trim and installation is the reverse of removal.

 

The new switches have a nice damped feel which the old ones were lacking due to age I suppose.

Update: Rear window lock switch goes off when pressed, not amber, and the illumination is more of a cream white than the crisp white of the other switches.  It's messing with my OCD already.  But the switch action is much nicer than before.

Have you a link for the switch? 2 of the 4 switches on mine have lost auto function so need to change it. Ridiculous that vw can't make a switch that lasts, never experienced this before on any car!

3 hours ago, Markbro said:

Have you a link for the switch? 2 of the 4 switches on mine have lost auto function so need to change it. Ridiculous that vw can't make a switch that lasts, never experienced this before on any car!

 

https://www.amazon.co.uk/gp/product/B08JLSDKDY/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1