sudden death???

[sea gnome]

I have had it for six months and it always has its polyps out except when I inadvertently touch it. I don't go in my tank much to reduce stress, I feed every second day. I did run out of liquid food a week ago but I havn't always been using it. I make my own food and dissove it before it goen in the tank. Water changes do every week. (5%). Nothing has changed except no polyp extention. The color is still the same, not bleached. Maybe it on vacation???