I don't believe they'd commit suicide although it does seem that way. They will wander around if conditions don't suit them, if yours wanders then that is a sign that something is wrong. There are many things that can cause this chemestry, lighting, temp, salinity and you have to try and correct it and then hope it will settle down. While moving about, they get too close and just get sucked in, they are after all very thin fragile membrane filled with water, the suction just pulls them in. I am glad I don't use them but mine never move, only 1x to split.