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Hi, that description and the code point to a issue with the main relay.
It is possible that as the relay warms up it fails, the most common fault with them.
I would replace it, I will find you a location diagram.
On the following website, near the top, relay k8, engine management. I would consider changing this relay and seeing how things go before you get right into things with this car.
This site shows where the fuse and relay box is located also.
I assume this is sorted, please rate ;)