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Welcome to the forum.
This is more than likely caused by a DIRTY or restricted FILTER, or some other restriction to the air flow such as closed dampers, closed registers, etc.
also, this problem can be caused by an improper setting of the "High limit" control. If its faulty or set too low it will shut off the burner and not allow it to re-fire again until the temperature in the furnace has dropped to a proper safer level.
Normally, a 'high' limit will be set to kick off at approx 180, but it depends on your furnace and ducting specs.
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