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Either could those symptoms. More frequently it's a bad bulb that has aged to the extent the ionization voltage needed to sustain the arc at normal operating temperature is higher than the output of a properly functioning ballast. But it could also be a ballast that is producing enough voltage to sustain the arc in a hot bulb. Sango's suggestion of switching the bulbs to see whether the problem moves to the other side (in which case its the bulb) seems like a good idea.
In my case it's both bulbs that go out randomly. So I'll try replacing the bulbs as a first step.
Not once have I had to replace a ballast for this symptom. Every time it's been the bulb with a one-time exception being a improperly installed bulb by the customer herself.
Not once have I had to replace a ballast for this symptom. Every time it's been the bulb with a one-time exception being a improperly installed bulb by the customer herself.
