Driving then 2005 Mazda 6 will shift down hard into 3rd gear

What is your question?

Is happening very often now AT light comes on. When I pull over and stop it goes off. Sumtimes it won't do it all day. Sumtimes it won't go but a half mile before doing it again.

What makes this problem better or worse?

Worse when I've drove 30 mins or so

How long has your 2005 Mazda 6 had this problem?

A while but alot worse now