Well, well, well!
Yesterday, I thought to do a Power-Reset of the car since I felt quite a few things were not working in the car and rather than blaming the specific circuits, to be sure it is not part of the 'Electric Ghost' problem.
Remember, I had removed fuse number 17 (rear passenger side window) in an attempt to catch the controller causing CAN Bus troubles. It is probably over a month now, since I had removed it. Both front windows would intermittently go bad before doing that, within a few days after Power-Reset. This time, the windows are working till now. However, down the line, the following things went bad:
Front interior light operation with opening of door (light glows at the press of button but not when opening door). Only rear interior light will glow when door is opened.
The RF receiver of the car. So to lock-unlock the car, I had to point the key towards door handle, to use the IR signaling, I believe. It won't work from within the pocket.
Horn - after showing some intermittent behaviour, the horn finally completely died, as mentioned in previous posts.
And guess what! After the reset, all these three things are working again.
So for now, I guess, my only next to-do is what Xulfiqar has been suggesting all along, i.e.,
1. to check and clean all the grounding points of the vehicle, and
2. check the X30 connector and clean its connections.
And if this does not resolve the problem, and given that there are random infrequent repeated clicking problem from behind the key (probably EIS), can the real culprit be EIS -- since it is the gateway of the CAN Bus! Can it do, all these things?