Only thing I can think of is that the bulb fixture is not fixed and that a hot bulb is vibrating around in there. Under those conditions a hot filament will open prematurely. Cannot be excessive voltage because the other bulb would have blown also.
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Only thing I can think of is that the bulb fixture is not fixed and that a hot bulb is vibrating around in there. Under those conditions a hot filament will open prematurely. Cannot be excessive voltage because the other bulb would have blown also.