I think my @#^$^% Dolphin Dynamic is about ready to go back to Costco!

It worked great the first two times I used it. I put it in the pool today after reading this thread and watched it immediately go to the bottom and then climb all the way up the wall. It scrubbed the waterline for about 8 feet then went clear across the pool to the waterline on the other side. But it quickly reveresed and went back down the wall across the pool and just to the edge at the bottom. Since then it has been working a path of about 10' back and forth back and forth barely moving sideways at all. That one section of the pool is very clean now It has been running for one hour doing this section that is about 10' long and maybe 4' wide. So, I think tomorrow I will put it back in the box and take it to Costco.

So, What should I get in its place? Anyone have any experience with that Blue Pearl unit?