Rpms revving High and losing all gears when driving. It's a 2001 Pontiac aztek

What is your question?

When I start the car and it hasn't warmed up but drives fine. But when it warms up it starts revving the rpms high and I lose all gears. Cut it off and crank it again and it drives fine for a little whole then it does the same thing. What could be causing this?

What makes this problem better or worse?

It's worse when the engine warms up

How long has your 2001 Pontiac Aztek had this problem?

A few weeks