This sounds similiar to the range of symptoms I get on my V60 T4. My gearbox will go from 6th to 4th at higher speeds, requiring a quick hand on the shifter to manually select 6th again. I also see some occasional electrical connection gremlins: They must be, because they go away if I let the car cool down a bit. I've done loom repairs on Volvos before, and it's incredible how wide the disruption is to all the systems connected to the damaged part of the loom. in my case I get intermittent reports of failed o2 sensors, as well as the gear-jumping thing. My mechanic and I have "discussed" the fact that the sensors and the gearbox ECU connection are in roughly the same place, under the car, is making me suspicious. And it's December, and I don't have a garage to work in.
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