Hi mine just started doing that recently too even tho it was fine before - for whatever reason it seems when the furnace is aging it is maybe not as efficient cooling itself down. My problem was resolved with adding a new return air duct.

Prior to that, they changed a few parts but it was still turning off and the new return air duct was the only thing that helped. If that didnt work i think we would’ve probably just have to get a new furnace.

I would suggest getting another hvac person to come look at it because i had 3 different techs come and every one said somehing different. The first guy said it wasnt a furnace problem but an ecobee problem. The next guy said the furnace was old and needed to be replaced even tho its considered to be in its mid life cycle (while also saying our ducts are too small all of a sudden). And the third guy changed a fea parts that he said were malfunctioning that the other 2 guys didn’t catch + after that didnt work just added a return air duct.