The trans mission on 2003sts suddenly lost hj and reverse at same time what is likely the issue

What is your question?

Fluids always changed regular and babied and highway mostly, car is Immaculate otherwise its a 2003 system nothing else wrong

What makes this problem better or worse?

Just.no hi gear or reverse suddenly and parked ed

How long has your 2005 Cadillac STS had this problem?

Parked right away