Are you printing with it every day? or turning it off for a period of time? What kind of maintenance routine are you doing with it? Maybe we can help if you let us know, how you are using it. Also how is your humidity level? I would check the humidity, as it is winter and when its cold and dry, the humidity gets really low. It can be detrimental to your print head if there is not enough humidity in the air. Let us know what your routine is, and maybe we can help you to get it printing better
