Need advice if I should prepare myself for something big that is coming.

This mornign started the Pajero and idled for a botu 10-15 minutes as she struggles to go into D in the winter.
Put her into R but she was nto moving, so applied a little accelarator and with a bit of a jerk she was off into the street. I put it into D and the same.
Driving along the N light stared flashing while drivign in D. I stopped and put it into P and back to D, but N kep flashing. Moved from auto to tip tronic and the gear selector was stuck in 3rd gear and I could move it up or down.
I turned the car off and back on and all was as it should be.
I have recently checked the auto fluid is red and levels on HOT.
Any ideas please as the strangeness started in the winter. It seems to be inline when the battery was disconnected at the beginning of may for a coupel of hours.
Thanks