Dozens of Perth drivers with keyless entry cars have been locked out of their vehicles at Lakeside Joondalup Shopping Centre, because of a mystery fault.

9News understands at least 80 cars have been affected since Tuesday, leaving shoppers unable to get into their cars.

Drivers with keyless entry cars have been locked out. (9news)

Drivers have been locked out of their cars since Tuesday. (9news)

The problem has been confined to a small area of the shopping centre, sparking concerns the devices were being deliberately targeted by hackers.

Police were notified but Lakeside Joondalup said they did not believe the interference was a deliberate or criminal act.

It is believed the keyless entry devices may have been disrupted by Wi-Fi signals or a radio transmitter, but the exact cause has not been confirmed.

9News understands at least 80 cars have been affected. (9news)

"We have been in contact with the Australian Communications and Media Authority, who suspect the disruption is caused by a device as simple as an internet router," it said in a statement.