Surely the slight loss of power and radio volume dropping is indicative of something more than just a loose speedo wire or dry solder? A momentary fault in the car's computer software program or electricity generation output due to either a software problem or bad electrical connection of some kind that changes at a certain engine or circuit temperature, perhaps?
The vss talks to the ECU and when it develops a fault it can cause all sorts of problems, including the speedo dropping to zero, loss of mileometer reading, radio becoming quiet and (most worryingly) occasional total loss of power.
With a total loss of power, braking and steering become very difficult, so it's worth getting this sorted. This happened to my Focus on a few occasions.
If it is the vss in this case, then the fact that it only happens after 4 miles and once on each journey are likely to be red herrings.
It's probably wirth pointing out again that I am presuming that the Mondeo has a similar set-up to the Focus.
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