A. Whenever you have any electrical need or problem
A. You might have a short, outdated plugs and switches, no ground, more power
A. Call electrician, take some of the load off the circuit
A. Add receptacle behind
A. Yes we install ceiling fans
A. Yes you can if the dimmer is compatible with the fixture
A. Breaker might be old, circuit might be using to much load ,loose wire, or a short circuit
A. No ground, loose connection, arcing