The FOB was working great till yesterday afternoon and this morning. Back to the old way of not working after parked for awhile. I am fairly sure its the battery in the truck. My wife's 22 Explorer had similar issues and a battery fixed it. Its funny, her battery tested fine like this one does but a new battery fixed the problem. Unless I get real tired of it, I'm going to wait till another issue (hope not) or till the oil change to have it looked at. Good luck to everyone that has similar issues.