Ooookay, that's just weird. It's like he has severe agoraphobia and freaks out or something. I really don't know what to say. What temperature is the water in his 5g? And when you do the water change, do you add back water that is pretty much the same temp? But wait, you're a senior member so yeah, duh, you most likely do.
All I can think of is some kind of temperature or chemical shock but I don't know what it could be. Do you end up with a lot of gas bubbles after the water change? Maybe . . . I guess it could theoretically be stress causing this but I've never heard of bloat and SBD being caused by pure stress and nothing but stress. How many times has this happened so far?
I really have no idea. It's very odd but hopefully someone will come along soon who does know. *bump*
Forgot to ask: how's Jayde doing?