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Hello my name is ***** ***** I will assist you. will the engine turn over again after some time? Are there any alarms / flashlights in gauges when it shuts down?
Ok the problem you are describing seems to be related to dirty injectors. I suggest you first start by removing the injectors and getting them cleaned with ultrasonic. Also replace the spark plugs if they have not been replaced for a long time. If the problem persists then you would need to get someone with a diagnostic computer to check all the sensors.
Ok I misunderstood your reply as I tought the engine turns over but does not start. In your situation it looks like after about 20 mins the ecu is loosing power. At this stage ut could be a variety of things from a loose wire to an overheating ecu... what I suggest you do is to inspect all wiring for loose connections and if.the problem persists then you would need to get the ecu out and checked