Stop start error

[MR T]

I have 2021 1.5 and 2 weeks ago while crawling along in a traffic jam I had reduced engine power to 3000rpm flash up for about 5 seconds and disappear again. It did this maybe 5 or 6 times and left the cruise control icon yellow. The car drove fine and it didn't happen again.
Yesterday while the car was idling for about 10 minutes same thing happened only this time it was followed by stop/start error and an engine light that stayed on.
I disconnected the battery for 20 minutes or so and plugged in a cheap code reader and it gave P0341 error and the engine light remained.
I have started the car a few times since then and no sign of any lights.
If it matters I hate stop start and turn the thing off religiously, I'm not too concerned about losing it but want to know if there is another fault somewhere?

 

[East Yorkshire Retrofits]

The start stop error is a symptom not the problem. Start stop is disabled anytime the engine thinks it may not be able to restart - for example the battery is low. Engine has a fault. It's also disabled if the cabin conditions aren't the same as the climate control settings.

The camshaft position sensor fault code is what caused the start stop system to be disabled

What mileage is the car on?