The suction power sounds weaker or the cleaning performance seems to degrade recently.

1. The dust bin is full and needs to be cleaned. The auto-empty base will empty the bin automatically, you have no issues with it.
2. The filter is clogged and needs to be cleaned.
3. The main brush is entangled and needs to be cleaned.
4. The suction level is low and needs to be switched to a higher suction level.