4WD light flashing?

Whilst driving, the 4WD, L and N lights start flashing. When this happens, the accelerator stops responding and the vehicle switches off on its own. Once I start it up again, it will drive another 5-6 KM, then it does the same thing again. I’ve changed the fuel pump thinking I’ve got a bad pump, I’ve changed the fuel filter, but nothing has changed.

The lights start flashing and that’s when the vehicle becomes unresponsive, the accelerator stops working and the vehicle just switches off.

If anyone knows what this could be, please do advise, as I’m having a hard time trying to find out what could be causing this.