It’s a good idea to avoid vacuuming leaves that are wet. Wait until they have dried out as they can be problematic when wet, and are much harder to suck up, consuming lots of battery runtime. They tend to clog up in the tube, reducing air flow and over time will degrade the life of the collection bag.
Avoid vacuuming larger twigs and sticks as they can easily clog up in the tube.
Also avoid sucking up anything else that isn't leaves.
To clear blockages:
First remove the battery.
Then remove the main tube and check for any small sticks that might be stuck inside by looking through the tube.
These are a common cause of leaves building up reducing air flow and causing blockages.