Transmission Problems (2.4L Auto)

[siether]

This problem just started last week but has been intermitent. What happens is that all of a sudden I will start to get hard shifts between gears and also the trans doesn't want to shift between gears and eventually my Trac off light comes on. Just yesterday my check engine light came on, but after sitting all night the light disappeared, and it was driving fine this morning. I had the fluid checked and it's full and clean. Has anyone seen this before or have any ideas on what it could be.