My Dolphin regularly misses points from the pool.
Make sure that the cable is not twisted or bent and that it is long enough to reach the entire pool.
Excess cable should be rolled up on the Caddy or laid along the pool.
You can also start the Dolphin from another part of the pool so that your robot changes its initial route.
Also, you can clean the filters and the impeller (Warning : Make sure to disconnect the power supply from the power supply before any manipulation).