BMW sluggish transmission problem, help.!

I have a 1992 325i automatic, that over the past 2 months the tranny has gone all sluggish. The car was lost a lot of it's speed and the kick down acellerator wasn;t up to much anymore.

I had a tranny oil change, new gasket and filter. The car is now almost as fast as I used to be and shifts like a champeon when the tranny is hot.

But, the tranny when cold takes time to change gear. Sometimes the engine passes it's rpm range when the tranny should change then slams into gear, also when I brake hard it goes into nuetral and if the engine is reving slightly more then idle speed it slams into first with a lurch. If I stop suddenly I have to stop all together and wait for it to change back into first so it doesn't slam back into gear. Very annoying.!

Any ideas guys?