My first litter robot was defective, and had to be sent back. The new one arrived a few weeks ago, but I am finding that I can't leave it on. My cats are very curious, and as soon as it starts to rotate, they rush up to the robot and put their paws on the step so they can look inside. They do this EVERY time. The litter robot pauses, they loose interest and start to walk away, but as soon as it moves again, they're right back there tripping the sensor with their paws on the step!!! The litter robot only goes through this process about three times, they in seems to get unhappy. I will come downstairs and all the lights will be flashing, and they cleaning cycle has been halted (usually in a way that leaves no litter for the cats to use the washroom in). I have to turn the robot off, and then on for it to fix itself.
Is this normal? What should I do? I wish the robot would just keep trying indefinitly, because my cats would loose interest then. Right now it only tries a few times, then stops itselt completly.

Is this a problem with the robot, or just my silly cats?