From the posts I have seen so far in this thread it is not clear just what the problem is.

1) From one standpoint it can be taken that Kurnia is trying to make a microcontroller device that can trigger on and take appropriate action to an event of something being plugged into or out of the power jacks on the primary AC power lines in a dwelling.

2) Alternately he is trying to say that his microcontroller is being upset and crashing or operating in an unpredictable way whenever some appliance is being connected to or removed from the power line.

So far I am still not certain which direction to give advice......building a sensitive detector circuit .. or .. filtering the power and ground of the microcontroller board.

Michael Karas