Meand the car,
Welcome to the bbs m8.....
Very good info and advise given to you here my friend.
My 2 pence would tell you to go get the trany fluid flushed and fresh fluid(correct spec) put in, and to the correct levels.
Run the car for a day using all gears, manual mode, reverse etc abit. So as to get the new fluid circulated proper.
And hopefully you will be sorted:thumbs:
Also while under there doing the fluid cx, have a look for a sensor(temp), see if it can be taken out, if it can, have a general look and a little clean etc before refitting it.
I don't have an Auto so can't really tell what exactly to look for, can't think of more than 2 sets of wiring to the trany, so one may be it.
This last bit I'm on about the sensor is a shot in the dark here, but as Terminator said, there is a temp sensing devise on the trany, if it's external and replacable 'I don't know'..
But it can't hurt to have a butchers while under the car having the fluid replaced!
good luck!