update:
So I have today received my new Crankshaft sensor (Bosch). When I took off the old sensor I noticed that on the tip on the sensor was a small pile of iron filings, black in colour. I would presume that this was the real culprit of all the symptoms I was experiencing.
But since the old one was out and had a new one in hand I anyway decided to install the new one.
Had it installed and went for a drive, and till now (fingers crossed) I can see that the problem has gone. Will be more sure once I make use of the car for a few more times.
So in order to help others for any similar case:
First symptom was, car starts normal when cold and also revs up above 4500 RPM without any issues, although not recommended.
Once engine reaches its normal working temperature, the car stutters when revved above 4500, also noticed that the idling was a bit rough. When engine is still warm and tried to restart, the car needed a bit more cranking than it usually needs. I also experienced a few times of engine stalling when on idle with warmed up engine.
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