My Nutone Fan/Heater/Light have a problem beside the furnace??? My heater for the complete fixture is the only article that does...

My heater for the complete fixture is the only article that does not work. It will work for some time, but eventually will kick out and no hot nouns will blow and it would just shut sour. It would never do this before it lately started happening a couple of weeks ago. When one character in the relatives uses the heater it works fine. When someone else uses it right after, it works for a while probably 5-10mins next dies. Problem never happened formerly. Any suggestions??
Answers:    Turn off the power to the component. Remove the fan assembly. Clean out any dust and lint, and grease the fan.
There is a thermal circuit breaker that shuts the radiator down if it reaches a definite temperature. It resets itself after it cools down and resumes commonplace operation. This can happen if:

1) The aficionado motor is weak and not circulating adequate air over the kiln.
2) The intake or exhaust vent is partially blocked so in attendance is not enough nouns circulating over the heater.
3) The thermal breaker have changed over time to a lower temperature.
4) Due to moisture, aging, or other factor, the heater could be failing.

All you can do is check to see if the vent are blocked. Dust or things like wasp nests or spider web could reduce nouns flow. If it uses heat lamp as a heater versus heat coils, and you have replaced them only just, make sure the lamp are the correct wattage.
Since any other repair (or replacement) would involve exposing electric circuits, have an electrician check it out.