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do you have the make and model number?
Ok this could be several itrms.
First is to make sure the ventpipes to outside are clear, no nest, leaves or water got in piping...can you check these?
basically we have a air switch not closing like it should.
It can be blockage in pipes
Blockage in drain system
Bad inducer motor
It is most likely water trapped, a leaf sucked in....
I would recommend not taking anything apart due to warranty. If only 2 months old you should have free service on it still.
You can use a shop vacuum on vent pipes and drain, but that is as far as I would go with it under warranty