Microwave Convection Function

[jkxtreme]

Microwave / convection issues:
When we operate the microwave convection oven in convection mode, I get an odor that smells like paper smoldering. Has anyone had an issue when using the convection mode.
Also, the microwave and our central vac come off the same breaker. When the microwave is operating, the central vac won't work. Does anyone know how the system prevents the central vac from operating when the microwave is running.