The ones in my tank only do that when they get agitated. There's likely something in your tank that is stressing them out. Do they only do it when you do a water change? or something else that could stress them out?
I have one. I moved him to where he attaches his Snot Strings to the Koralia instead of my corals. It is actually pretty cool to watch them eat. And he likes it there because stuff flows into his web all the time.