A:AnswerUnfortunately, Logitech does not officially offer replacement keycaps for the MK345 keyboard. Replacing the keycaps could potentially void the warranty and might affect the keyboard's functionality.
A:AnswerI haven't noticed any lag with my keyboard and mouse. Could it be a problem with your computer? Maybe a new update at the same time you tried the new keyboard and mouse? That's pretty common with older computers or computers with limited working memory.