Basin mixer tap handle hard to operate

[akist]

The bathroom's basin mixer tap has become very stiff in all directions (left-right and up-down) otherwise the tap works properly. Other same taps in the house are all OK. They are all about 1.5 years old.


hansgrohe Logis basin mixer 100 w/o waste


Where should I be looking to fix it? Would it require removing it from the basin?

 

[denso13]

Where should I be looking to fix it?

A new cartridge, if you can find the correct one. This could be it, maybe check it is the same as what is there, https://www.screwfix.com/p/hansgrohe-35mm-mixer-tap-cartridge/688JX