Transmission problems, help needed

[Godzi]

Hi everyone,
I am new member but I was reading a lot on this site before I registered and I see there is a lot of knowledge here.
I bought 2003 X5 4.4i with transmission problem, I am mechanic and I have no problem fixing many things including engine but I am not very familiar with automatic transmission.
I will try to explain what is going on as short as possible.
Car starts good cold or hot, but transmission works fine when cold, after 10min of drive it suddenly revs rpms and goes to fail safe program with hard bang to 5th or sometimes to 4th gear. I have scanned it and there is several things showing up.
Transmission temp is -55c
Replaced harness in transmission and still same reading.
Solenoid 3
Map cooling activation
5A brief power interruption
Dynamic stability control
And also weird wheel speed reading when parked it is showing
LF 0, RF0,
LR 4850 rpm
And no RR wheel at all.
Is there anyone who had this kind of problem and is there solution to this.
I just want to make sure that problem is transmission it self not something else causing it to fail.
Excuse my English, it's not my first language.
Thank you in advance