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it sounds like 1(or more) of the motorised valves arent working.find the valve and make sure you are getting power to it via a tester,if so then it probably needs the head on the motorised valve changed
On the assumption that your bathroom is 8 ft high, then the volume of air in the bathroom is 5x8x8 or 320 cu ft. Even if your fan is 80 cfm it would take 4 minutes to completely exchange the air. Leaving the door slightly ajar would assist. To overcome a similar problem, I installed a second fan with a push button 10 minute timer so the fan runs for a few minutes after I leave the bathroom.