I have a goodman furnace that is a year old. The other day I came home to a freezing house which should normally be at 65 during the day. I took off the front panel and it would kick on for no more then a minute and then would shut off. It kept doing that. I cleaned the flame sensor and that initially worked for about 5 minutes but then started acting up again. Filter is clean too. Thanks

Sounds like you have a bad sensor because I had the same problem last year.

With what did you clean the flame sensor. I suggest either a scotch brite pad or steel wool.
Also make sure ALL grounds are clean & tight. You can use either a wire brush or fine sand paper to clean them.