TOT Brandon Cartwright loves taking a trip in the car with his mum.

But a mystery fault on mum Lisa Mallinson's Nissan Micra has left the one-year-old locked in the car FIVE times.

The high-tech, no-key locking system requires just the press of a button.

But Lisa's vanilla-coloured Micra has a mind of its own.

"I put him in the car and lock the door while I am outside the car," said 23-year-old secretary Lisa, of Highfield Avenue, Meltham.

"But sometimes, when I press the button, the door just won't unlock.

"On at least five occasions I have had to stand there pressing the button and pointing it at the car. It can take up to 10 minutes before it finally decides to open. It is a nightmare."

And Brandon is equally confused by the rogue Micra.

"He sits and looks at me, as if to say `what is mummy doing?' " said Lisa.

"But he does start to get upset, because he is in the car on his own and he can see that I am getting upset as well.

"I bought the car from Dixon's on Leeds Road, Huddersfield, last year.

"It was brand new and I did not expect any problems with it. When I take it back to show them the problem it always works. It is Sod's law."

But now Lisa has found a way to rescue little Brandon.

She says: "Basically, there is a way of using the key to start the engine. On the passenger's side there is a flap you can lift up.

"At least I know now that I can get Brandon out - or get in myself - when it happens again.

"And maybe when it does I can take it to the garage, to show them I am not going mad."

A spokesman for Nissan said the problem was very rare.

He added: "We have had a few cases of this happening before, but it is very rare.

"In the past we have discovered that some radio frequencies used locally can disrupt the locking system.

"But it is difficult to say whether that is the case here."