My first robot , the nautilus cc, never got suck on the drains, however, when it finally died, I upgraded to a Dolphin advantage pro . It gets stuck all the Dang time! Maytronics told me to use the clips. I’ve spent gross amount of money on 4 clips. Dolphin advantage still gets stuck all the Dang time! I’m willing to try something else . What is the mat thingy called?