A couple of possibilities:
I've seen globes with a make & break filament before... they break and intermittently make contact again. Also, the same can occur in the base of the globe.
Poor earth connections and poor lamp contacts.
Check voltage at the lamp holder when the globe isn't working... if there's power there then, it's the globe, if not, the problem is elsewhere.
Replace the globe and see if the problem persists.
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