Weird car issue...any thoughts or ideas? Got home at 8:30pm car was fine, I locked with key fob and went inside. An hour later, my neighbor rings the doorbell and my horn is weakly going off and lights weakly flashing. Key fobs won't work. Made key entry, car wouldn't start, so we jump started it and all seems fine (we'll see if honking begins again)...I went out after leaving car off for 10 minutes and car starts, all lights are bright, doors open and close, but now key fob doesn't work at all....2012 Toyota Sienna.