Engine shuts off intermittently?

I brought the car new in 2018 and for the 1st time last year (2023) the issue started. The car engine died on 4 different occasions.

Dates as follows:
• 6/6/2023 (Winter)
• 11/8/2023 (end Winter / Spring)
• 19/10/2023(Summer)
• 15/12/2023 (Summer)

All 4 times the issues occur in the same driving conditions. Car is started and driven in 1st gear, once you press the clutch to gear to 2nd, the engine shuts off. Always at low speed between 1st and 2nd. The last time the engine died the car was driven quite a distance in 1st in a parking garage and once clutch was pressed the engine died. If you try to start the car after the engine died the starter will swing and the car shakes a lot (like when the timing is out). There is no warning that the engine is about to die and further once the engine died there also no engine management indicator appearing on the dash (no fault code). If you let the car stand for around 40 to 50 minutes the car starts normally and drives normally (until it happened again without warning).

After the 3rd time this happened, I took the car in to my mechanic (in October 2023) and the following was done:
• Throttle body was cleaned.
• Carbon flush performed.
• New Crank Shaft sensor fitted.

I thought the issue was resolved until it happened again in December. Any suggestions why this is happening, or do you know if anyone else had a similar problem – and what could a possible solution be to is issue.