Ohhh, it did it before, too, eh?
Sounds like a scan tool would really help... most let you record data, would be VERY VERY helpful to plug it in and take it out and do some WOT pulls and record what the sensors all said and what the computer was telling the trans to do and so forth.
If you don't have one I'd suggest finding someone who does and who can interpret the data it'll give you.
__________________
|