I recently installed a couple of sets of the Mondella cadenza wall top assembly taps in the shower and a basin set (https://www.bunnings.com.au/mondella-chrome-cadenza-1-2-turn-basin-set_p0684081). Worked perfectly at first, however I’ve noticed over the past 2 weeks since install the cold water (most used) taps are getting stiffer and stiffer to the point where my kids can no longer turn them. Any ideas what’s causing this and how I can fix it?