Central locking in hot weather
 

Hi all

I have a problem (on a 1996 Honda Accord 2.0i ES Auto) best described as
follows:

The central locking works fine with either the remote or the key. But it
seems that the system unlocks itself after several hours. This seems to
occur in hot weather but when it has cooled down -ie the doors unlock at
night!!

Any thoughts as to what might be wrong?

Thanks

nanouk