It can be issue with the door switch check all fuses and tap on door switches also check contacts behind switch when in center position by removing unit.
my immobilisers keeps losing "the signal between key and the lock which happens on and off
have tried to switch off and on the car
pressing the key for a longer period of time
and trying a number of times
but i cant get it.
i have spent a fortune to rectify the problem but it still comes back haunting
help