Will not start after running?

So, really weird problem… I have had this Echo for 15 years and it has been great. I have ran it to death. I have always been able to fix it but this problem has stumped me. The thing will run perfect. It starts on first pull. Then it will shut off after 30 min and it will not start again until it is completely cooled down. I am talking completely cooled down. I will need to wait up to 20-30min to start it again. Things I have down:

• new carb
• new hoses
• new air filter
• new spark plug
• new gas
• added more oil than normal

Thank you for your help.