Key In Switch Alert/elect Lock Problem

[CCLARK2000]

SIRS:
I HAVE A 2000 BLAZER LS,
THE PROBLEM IS THAT THE ALERT TONE FOR THE KEY IN SWITCH CONTINUES TO ALERT AFTER THE KEY HAS BEEN REMOVED AND DOORS
CLOSED FOR SEVERAL MINUTES. ALSO THE ELECT LOCK WILL ACTIVATE BUT THE DRIVERS DOOR WILL UNLOCK ITSELF, TO LOCK IT YOU MUST LOCK IT BY PHYSICALY PUSHING THE LOCK ON THE DOOR.
WHEN I PURCHACED THE VEH (USED) IT DID NOT DO THIS. BUT COME WINTER AND TEMPS BELOW 35 OR SO IT WOULD. AND OVER THE PAST SEVERAL YEARS IT HAS PROGRESSED TO A YEAR ROUND SITUATION.
I HAVE TRIED SEVERAL THINGS TO RESOLVE THIS SITUATION TO NO AVAIL. SOMETIMES YOU CAN WIGGLE THE KEY AND IT WILL STOP,BUT IT STARTS BACK THE NEXT TIME YOU TURN THE VEH OFF.
TAKEN DOOR PANEL OFF TO LOOK FOR LOOSE CONECTIONS.
DISCONECTED BATTERY TO RESET COMPUTER.

IF ANYOUNE CAN OFFER ADVISE IT WOULD BE GREATLY APPRECIATED.