This season is the first time ever that this has happened. The furnace starts, gets a flame, runs for a while, then it flames-out. It sounds like the oil pump is still running (I hear like a spraying sound). Nothing shuts off. Then the flame will come on again, but may continue flaming-out intermittently. The flame loss occurs at random intervals, and duration.

I suspect that it may be dirty oil particulates which are momentarily blocking the oil line. But then, I'm not an oil furnace expert.