If the robot vacuum is not cleaning as well as it used to, check whether the brushes are worn out.
The side brushes are usually the first to wear out and often need to be replaced every 6 months. Check the main roller brush too.
Worn out or clogged filters can also affect cleaning performance by reducing suction. This makes it more difficult for the vacuum to pick up dirt and pet hair.
After every cleaning, make sure you dust the filters to remove any hair and dust stuck on them.
If it is a foam or mesh filter, you need to wash it every 15-30 days. If it’s a HEPA filter, replace it after around 6 months.