Once it gets warm and you turn it off it will not start again until it cools down. Is this a relay or sensor?

Hello, doesn't sounds like a relay or sensor. You will need to find out if you have a fuel delivery or ignition spark issue occurring. If you have no fuel, check the fuel system. If you have no spark, it could be an ignition module concern, or some other related issue. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops