Since I have owned my 69 RR (about a year), it has had a strange periodic glitch. Every once in a while, the car will be completely dead....not even a click with the turn of the key. I can tell when this is happening, because when I open the door, the dome light won't come on. This issue occurs completely randomly, sometimes after the car has been sitting for a period of time, and sometimes after it has been recently driven. Over the past year it has happened maybe 5 times. The issue is resolved simply by disconnecting the positive battery terminal and reconnecting it. Once that is done, everything is normal. Thoughts?