Cadillac CTS Transmission Reverse

I Was Driving, And It Was Like It Went Into Neutral. It Will Not Go In Reverse, Or Drive. But It Still Rolls In Neutral. It Was Not Having...

This Problem Happens In The Morning After The Car Has Sat All Night. We Live In Northern Minnesota, But We Have A Heated Garage For The Cts...

Why Is It That Sometimes My Cadillac Want Go Into Reverse ? Its Like Its In Nutral