Climbing Long, Steep hills leaves my tranmission stuck in 4th gear.

I have a problem and I would like to know if anyone else has experienced this. Whenever I drive up a hill for any EXTENDED period of time, where the transmission is using 4th gear to pull me up the hill, after the crest of the hill, my car will stick in 4th gear. My manumatic mode disables itself and wont allow me to change the gear manually. Even going downhill after getting stuck in 4th will not make 5th gear come back. The only fix I've found is to either pull off the road and turn the car completely off then back on, or to break the 100 mph barrier and sharply let off the gas, which still does not restore the tiptronic mode, which stopping the car will do. Has anyone else experienced this? Please Help. I've taken my car to the dealer, after testing they told me that if i'ts not throwing any sort of code or no warning lights are going off then they can't find the problem. I know that in the manual, it says that if the transmission gets too hot then manual mode will become unavailable, but what worries me is even after driving on flat roads after the hill, the transmission will not go back to normal.
 
I had the same problem, minus the smoke, driving in the mountains here in CO. I ended up pulling off the road and letting the car sit for a few minutes and it was fine the rest of the time in the mountains. BTW, I have an '07 with 20K.

Also, I'm trying to figure out what ATX fluid is in this thing, as I want to upgrade it. Royal Purple's website does not list any Mazda ATX's. Considering other parts sharing with Ford vehicles, does anyone know if it's Mercon ATX fluid?
 
From the research I have done you will need to get an atx fluid that is ATF-MV, this is different than Mercon-V. It is a mazda specific specification. Redline and Amsoil both make good synthetic transmission fluids that are atf-mv compatible.
 
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