Voltage Across the Gate node collapses down to about 1V, which then makes the system to turn OFF. What could be the cause? It starts off at about 16V, which is not wrong, but oscillates and collapses until it gets below the threshold gate voltage of the P-fet, causing it to turn OFF.
September 18, 2023
You should remove the space in Load Capacitance. I added a resistor, R4, and a square source to replace the Enable part.
You my note that at 1MHz, your enabling signal is just too fast (simulate a Frequency Domain), but at 10Hz, with a time domain simulation, it is fine, without apparent problem.
September 19, 2023
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