I’ve posted about our dud of a robot before. I’m back because I’m struggling with it yet again. I have the A30 or (Dolphin s300). It’s not picking up anything in the deep end. It still is scaling walls and seems to be grabbing the majority of the dirt in the shallow end, but no luck with the deep end. Is there anything I might be missing or do I have to call customer service again? I’m thinking maybe it’s a filter issue or something? If someone has had similar experience I would appreciate it.