I replaced the trans. a few years ago with a 97' bird unit w/37,000 on it........about 55,000 now, so it should be the updated pan on it.
I have come to notice driving today around lunch that it is working fine.
So all of the instances that this has been happening that I can recall have been when the temp. outside is extremely cold. 8 degrees this morning, 10 degrees at the auto show, but around 32 when I went out for lunch, and ran fine.