NHTSA Complaint #11001829 — 2008 BUICK ENCLAVE

I DROVE MY BUICK ENCLAVE 2008 TO VIRGINIA FROM FLORIDA WITH NO PROBLEMS BUT WHEN MY TRIP WAS COMPLETE, I TURNED CAR OFF TO GO IN GAS STATION AND TRIED TO TURN IT BACK ON...IT DID NOT START. IT STARTED TO MAKE A TWITCHING NOISE AS IF SOMETHING ELECTRICAL WAS WRONG. I GOT IT JUMPED..BOUGHT A NEW BATTERY AND IT WORKED FINE FOR 6 DAYS. NOW, IT WILL NOT START AT ALL UNLESS IT IS JUMPED. IT ALSO LOCKS THE KEYS IN THE IGNITION IF I TRIED TO START IT WITHOUT A JUMP. THE CAR CONTINUES TO MAKE A TWITCHING NOISE WHEN IDLE. IM AM AGRAID OF A FIRE IGNITING. I NOTICE THAT EACH TIME I HAD A PROBLEM WITH THE CAR , IT HAD RAINED SIGNIFICANTLY THOSE DAYS. I KNOW OF ANOTHER OWNER THAT IS HAVING A SIMILAR PROBLEM WITB THEIR 2008 BUICK ENCLAVE. PLEASE HELP!