Hello I'm new here...and I need your help....

The problem or issue is with my Ford F150(Lobo 2003 in Mexico) right now is happening that some nights I close the doors locks with my original ford remote control(key holder) and the doors locks close fine, but on the morning I saw my doors locks opened..!!

Then I made some tests...and I found that something is not working properly because after many tests I found that some times after close the doors locks....this open after some minutes.....then I thing that maybe some relay is not working...!!


Has somebody this experience..??
Is the problem some Relay....what is the name..??


Best Regards...