Hi, first time poster and seems I'm about to go through the same issues.
Land Rover Discovery 2.0 SD4 HSE bought from new in 2019. Began with the no power issue some time late last year so took the car in for investigation (Marshals of Cambridge). After a £650 bill, they said it required upto 8 litres of oil and they replaced a seal somewhere under the engine (sorry but i dont know too much about cars).
The performance did improve and I felt more confident coming out of busy junctions as the pick-up was as it should be.
Scroll forward to this last week, I've noticed a bit of vibrating and also a bit of power loss but again, checked the oil and topped up, all ok.
Drove over 200 miles to Glastonbury on Wednesday, had the Performance warning on the dashboard and managed somehow to get there and decided to deal with this week.
Got back to the car after a few enjoyable days at the festival expecting the car not to start but it did and was fine, 8 hours or so it took to get home and not one issue, performance was as I would expect.
Today has been different, again struggling with power and stalling. I've just dropped it off at a local Land Rover specialist as it is booked in for a service, on mentioning it to him, he said it is a known issue and that the engine is probably failing !!! He is going to run a few diagnostics so I'll update on here with the findings.
On another note, my finance on the car finishes in August so I can hand it back but as the value is almost £15k more than the settlement figure I'm looking to sell it, just wondered what peoples thoughts are on my position.