Hi and greetings Mike, welcome to the router forum community.
Are you hogging out the whole piece or cutting the main part out and then cleaning it up.
Using a small bit cutting a piece out that size your bit is cutting three sides at once causeing a lot of heat. Try using the largest bit that will work with your pattern, if not cut out as much excess as possible before routing
Looking forward to your participation.
Filling out your profile to include (first name,tools and short bio is strictly (optional )but does help members to better relate to each other.
Thank You John