I have replaced the ignition switch in my truck twice this year and it has started doing the same symptoms again. Should I be looking at something else that will cause the ignition switch to have problems? The initial symptom is when I turn the key off it will pop like pulling the plug on a microphone, the radio will go to a preset station, the temperature control will change to a default setting. If I don’t change it the symptoms change even to a point of not starting. Any advice is appreciated.

Thanks
Ronnie