K12 engine cut out

Hi all, just joined so first post.
We have a 2003 K12, done about 70k miles.
A couple of weeks ago on the way home from work the engine cut out, doing about 60mph.
Driving along quite happily when felt power go. Revs stayed up but seemed stuck, couldn't get them to do up or down. Eased over into a bus stop, turned off the car and restarted it, everything fine.
It's been good for 10 days or so, then today, it's done it twice again, on the motorway.
Same as before, driving along when feel power go in accelerator. By the time I have free wheeled to a stop it is fully stalled and all the dashboard lights up. Today it took a couple of goes to get the engine to power back up.

Does anyone recognise the symptoms or have any ideas? Need to get it to a garage after the weekend, but don't know where to start.

Thanks in advance.
 
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