Pete's service is highly recommended!
Our 2007 Roomster suffered from intermittent windows for approx. 2 years. Dealers could not find the problem.
It's not easy to diagnose the faulty Drivers side motor as defective door-looms and switches may show similar symptoms.
Problem was, the 'dead' windows would work if both sides are disconnected, left a while and re-connected.
Then they work until the ignition is switched off for a period of time. After that, they are 'dead' again.
If window-switches and door-looms are confirmed OK (and they are cheap + easy to change) then the drivers side motorcontrol-module almost certainly needs repair. As Pete says, other VW group vehicles from this period, e.g. Polo, Transporter use the same motors and are similarly affected.
I sent the suspect motor to Pete who immediately confirmed it was defective, did the repair work and put it on test.
Within days I had the repaired motor back in place, both window functions restored immediately (just needing to reset the 'one-touch' function).
Congratulations to Pete who persevered to research and resolve this common fault, making a repair economically effective (other option is a replacement motor, around the eyewatering £200, only from Skoda / VAG dealers).
The great bonus is that a perfectly good motor unit does not need to be thrown away because of a repairable module fault.
Well done Pete.
Highly recommended, and a very knowledgeable and valuable member of the Skoda community.