I guess you do! My vet (who does doggy water therapy) tells me dogs are on average 30x dirtier than humans, which means you have to work harder to keep your pool sanitary.
I have only used similar suction cleaners a couple of times and not for many years. Didn't care for their performance, personally. So unless one of our support team is familiar with that unit or a similar one, I cannot help you. I did have a Polaris 165 (Actually, still do) that did similar things but it was due to a clogged port in the randomizing mechanism. I ended up going to a full robotic--first a Dolphin Dynamic, now a Blue Diamond, which is awesome.