2004 Nissan Micra Boot locking problems?

This car has a remote control lock/open boot only. It can not be opened manually. Recently the lock has been operating by itself whilst driving. You can hear it unlock. Now it is locked and will not open. If you put your ear to the lock and operate the remote there is no operating sound from the lock. I realise I can get into the boot via the back seat but this does not address the problem.
Also same car the airbag light passenger side will not go out.