If it were a flame sensing issue I would expect a lockout AND nothing running. The fact your inducer is running is not expected on a normal lack of flame lockout.
Since it's intermittent it will be a PITA to diagnose. Here's a description of how your control should - *.*/wrdhom/pdfs/instruction_sheets/0037-4836.pdf
It seems the lockout will vary in length which implies that, after so many minutes, it will try to relight again. So I would suspect when you hear the inducer, it's trying to light the furnace. If you can, observe what happens when you're there. Does the ignitor glow bright red to * Can you hear the gas valve * If you're uncertain how this should look and sound, turn off the furnace and then when you turn it back on, watch as it lights. It is possible you have a flame sensing problem albeit a very intermittent one. You may also have an inducer pressure issue so check the flue to be sure it's clear.