Loosing Over Drive.

My car has started to loose overdrive i think. It does this odd thing sometimes when im crusing on the hiway at about 60 when it starts going in and out of overdrive and after a while i think it stays out of it. I cant recreate the problem, it seems to happen randomly, happened 3 times now. I'm sure loosing a gear is not a good thing, might be a sign of trannys upcoming death? It shifts ok otherwise , not that great does the long ford granny shiftls like it always did and acts crappy when its cold. car has about 165k miles on it its a 94gl with a vulcan and its an ax4s tranny.

So what you guys think? some stupid little solenoid issue or tranny is dropping dead? The fluid is nice and clean and synthetic i changed it every year which was about 10- 15k miles apart . I'm not going to invest gobs of money in this car honostly we all know its cheaper to buy a new taurus or something similar.

So what do you guys think?