Hi all...hoping someone can help me out with a weird transmission issue...

So, vehicle gets warm and the problem starts, although intermittent but frequent.

Basically as I'm cruising in OD and let me foot off of the gas, found that the trans goes into neutral...when I re-apply a bit of gas you can feel the trans re-engage 3rd gear, then slide back into OD.

So when it's doing this, and you happen to come to a full stop, the truck is actually sitting there in neutral (take foot off brake...it sits there not moving). Then apply a little bit of throttle and you can literally feel the trans come back through the gears into 1st with a couple shifts.

So all-in-all, trans keeps netutralizing while driving. Is there a TSB or some type of re-flash that fixes this? Seems like a computer issue. Trans performs fine otherwise.

1999 Blazer 4X4

Thanks!!!