Please let me know if yoh find a solution for this.
I went to Tariq Road to get this issue checked and one of the guy there told me that the buzzer needs to get replaced and will cost around 2.5 to 3k. I had the same confusion that if the buzzer is spoiled then how it come it starts working randomly.
Above all, he said that this buzzer would be purchased and replaced from Tibet center market only so he has to take the meter there. I was reluctant to let him take the meter to the Tibet
market as they might take out the genuine stuff from it.
This has become a headache. Unable to find a good car electrician in Karachi.