Kitchen faucet issue - Hansgrohe Metris Select [View all]

We had one of these installed last year. The flow was always low (eco friendly - so called) but now it's definitely slowed down. I've contacted Hansgrohe but they can't give me a solution. The water pressure is fine at the dishwasher and washing machine - same water line.

I cleaned the filter at the outlet but wonder if anyone has had experience with this kind of problem.

Thanks