Peugeot 406 engine cuts out after 2-5 minutes

The problem had been going on for a while. The engine cuts off after about 2-5 minutes even while driving and only starts again if the battery terminal is disconnected and reconnected again but the car must be completely off(key out of ignition) then it happens again. I’ve changed the plugs , the egr valve and even the bsm(what the mechanic told me) but it only stopped for about a week then started again.