Looking for ideas on what to check. 2005 3.5 L GT. Went to leave work on a hot day and just got a click when trying to start. Got a jump and started right up. Battery was a couple of years old so replaced it. Started right up. Went to clean up then go to work and just got a click again. Jumped it and it started. Drove it a few miles then turned it off and it started right up. Several starts the next day without a problem then just got a click. An hour later it started fine. Hate to turn it over to a shop to find the problem, it just sounds too simple but I don’t know what to look for.