I have a Dell printer [all in one 713W maybe 18 months old. Have only printed maybe 20 pages of black text and only 4 or 5 pages full color. I typically go 2 or 3 months w/o printing anything. My printer is set to do maintenance once a week but it never prints anything out when it does so. It's telling me it is out of ink.? I ran 3 or 4 test pages and did a deep cleaning the jets twice. Shows black and all 3 colors very low. Is it possible ink cartridges dry out naturally even if one barely uses them? It has 2 separate cartridges.