Hi people, newbie here.
I came across this thread albeit mostly from a fair while ago...
I have the SY 1 Territory turbo (ZF 6 spd) which I had a very similar issue with. symptoms were slipping into neutral and hunting for engagement, limp mode, ABS & traction control lights, lost speedo, drive indicator flashing etc etc. Ford mechanic found radio interference at the time of the event/s (I left the car with him for a week so it would fault on him).
The cause for the symptoms were one or two of the coil packs has corroded and was earthing on the head interfering with the communications to the instrument cluster.
A new set of OEM coil packs and fresh plugs ($1000 in parts) and I was away. If I was smart enough I would've purchased an aftermarket set of coils for a third of the price.
I really hope this is of use. I know the feeling of unknown expense when the possibility could really hurt.