Ive recently brought a Fiesta ST in Australia, but I have the same issue that 1 / 10 times I start the car - Sync doesnt start. get access to CD / Radio and not Voice, Bluetooth, USB, Line-in. If i turn the car off and lock it for a few mins and come back to restart it - it normally fixes it.
I brought it up with my dealer at its first service but they didn't have any idea about it.
Does anyone know if the Ford Mytouch system from the US fits into our cars, ive heard this is bad too but surely it will be better.