Aquabot Bravo faster than Turbo

by Doros
(Cyprus)

I used to own an aquabot turbo and replaced it with an aquabot bravo. It is really fast and cleans the entire pool. But the problem is when there is dust on the bottom of the pool. Bravo seems to pick up the dust but after couple of hours the dust is back on the bottom of the pool. Also bubbles are coming out of the handle is this normal?