As a mechanical device, your piano’s “action” needs regular adjustment called “Regulating”. A regulated piano is more responsive to the demands of the pianist. Actions parts swell and shrink with humidity changes and it is not uncommon for a new piano to need regulating within the first year as parts begin to break in when used.
Likewise all movable parts on any new or older piano show the effects of wear as the piano is used. Regulation is needed to compensate for the settling of cloth, felt and buckskin aside from the dimensional changes in wooden and wool parts due to changes in relative humidity. Small adjustments are common recommendations by your piano technician and should be accomplished in order to avoid unnecessary repairs and replacement of parts in order to avoid more frequent full scale regulations.