When Accelerating from a stop & expecting a shift to 2nd the engine drops to neutral why?

What is your question?

1994 Kia Sephia, Accelerating from a stop and; expecting a shift to 2nd the engine drops to neutral, on fast accelerating it will shift up, once i'm at 40 mph everything seams ok, slowing to a stop everything seams ok.

What makes this problem better or worse?

Hot or cold does not matter but sometimes it works ok (not often)

How long has your 1994 Kia Sephia had this problem?

a relatively new issue