'Sticky' Single Lever Tap

First time post for me.
Just wondered if anyone has had any experience with determining the fault with, or fixing, single lever taps. Have a 'Franke' brand single lever kitchen tap, that after 5 years of use, is starting to get difficult to flick on and off (faucet rotates fine but on/off lever for the water is getting quite difficult to regulate).
I might have to wheel the plumber in but thought it might also be something I could deal with myself.
Any ideas?


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