The robot notify me every week about the dustbin is full. But when i checked it each time I found out the container still quite empty. Is it the filter need to clear? I did that like every 3 three weeks.
I'm seeing the same thing with my robot. @mrmegadeth has explained this quite well in this thread: https://community.purei9.com/discussion/378/dust-bin-is-full-error-message-despite-empty
As you have already guessed, it is the air filter that gets clogged with fine dust and needs cleaning (I do it carefully with my standard vacuum cleaner's dusting brush)
Wash the filter with water, no soap, and then let dry for a few days. It'll fix it.