Turning off the start-stop system does not get rid of this cutting out. Nor does the cutting-out happen only at low speed. However, I agree with Ootohere on one point: cutting-out can be avoided by keeping the revs up. But as it cuts out when one foot is on the clutch and the other often on the brake approaching a junction, keeping the revs up requires toeing and heeling. OK for me but not for my wife who is the main driver.
Skoda documentation says that the start-stop system on a manual Karoq will operate when the car is stopped, the gear lever is in neutral, and the clutch pedal is released. But the engine cut-out that I and others experience meets none of these three conditions. It can happen when the car is moving, the car is not in neutral, and the clutch pedal is pressed down, not released. Therefore the cutting-out is not caused by the correct operation of the start-stop system as described by Skoda, though it might possibly be a malfunction related to that system.
Ours is a manual car (2023 1.5 TSi Sportline). As coasting mode is provided only on the DSG, this is not a instance of coasting mode operation in my case.
Some people have said that when the engine cuts out they can re-start it by dipping the clutch. That is not my experience, for the simple reason that it cuts out when the clutch is already dipped.
As an aside, when I have reported this to a Skoda dealer (who of course said they were unaware of a problem) I have taken care to call it cutting out and avoid the word stalling, for two reasons: as soon as you say stalling they will dismiss it as driver error; and more fundamentally, a driver stalls a car when they raise the clutch pedal, not when they press it down, which is what happens to us.
Our car never did this for the first 18 months of its life. Then it happened with increasing frequency over a couple of months in the later part of last year. Again that suggests a developing fault, not normal operation. It happens to both me and my wife. Our driving styles are very different, so driving style is not likely to be the cause either.
There is an extensive thread on this from T-Roc owners, linked from page 1 of this thread.
Thinking about this, it seemed likely that for whatever reason, the engine management system was allowing revs to drop too low. I first tried to resolve the problem by switching to Sport driving mode which is available on our Sportline. This alters the throttle mapping. Pinkpanther on this thread tried something similar by altering throttle mapping using Carista.
For us, Sport mode helped. Cutting out became much less frequent but was not totally eliminated. My next guess was that one of the sensors that feeds data to the engine management system, or some other component related to idle speed (the idle control valve, as a total guess) had started to get sooted up after 18 months of use. My wife and I usually drive the car very gently. It was time to see if hard use would help by clearing something out. Over half an hour or so I worked the engine as hard as possible, so the indicated power output showed 110kW, the engine oil temperature reached 110 degrees, and the revs were at 5000 whenever possible.
That was nearly three weeks ago and the cutting-out has not happened since, either in Sport or in Normal mode. Before that, it was happening every day or two. For now, things are much improved. Of course, the problem might re-appear tomorrow. We’ll see.