Looks like around 4000 RPM in 5th you downshift to 4th, and then the transmission goes nuts.
Are you able to log the SST temperature via EvoScan or something similar? You can even use the Torque app with a Bluetooth adapter, you just need the right PID set up.
That way you can see if the fluid is really overheating, or if the overheat message is being caused by something else.
Does it happen when you downshift from another gear, say 3rd to 2nd, or 4th to 3rd?
Check the DTC codes in the car, you'll need a MUTIII tool for it since the SST codes aren't your "normal" codes; not sure if Evoscan 2.8 can do it, but back when I was having transmission issues the codes never showed up for me via Torque, even though the Mitsu techs could read them.
I want to say as an uneducated guess that you're losing complete fluid pressure when you downshift there and the transmission has no idea how to handle it, and shifts you into first gear. Last time I got the slowdown on a track, it put the car in limp mode but I don't remember it shifting be back into first gear. It could be an issue with the mechatronic unit perhaps?
2011 WW MR -
MHI 18k / ID 1300x / Walbro 450 / WTF Tuned Flex Fuel Kit / Cobb Hard Pipes / Tial QRJ / ETS Intake / ETS Recirc Downpipe / ETS HFC / Invidial Q300 / DrivenFab Recirculated AOS
Chris Carbee Tuned on Tephra v3, making 400 horsepower to all four wheels, because that's the only place power should ever be.
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