That can happen, but it shouldn't. You could try charging the battery for a longer time, but if that doesn't work either, then yes, I would return it. An interesting alternative, although a little more expensive, might be the Xiaomi G11 cordless hoover. It has little knives embedded in its turbo brush that shred hairs and prevent them from wrapping around the roller. Maybe this would be an alternative to the Dreame T30?

Xiaomi Mi G11