Think about whether you have a lot of metal in the way of the signal, multiple walls, or double-pane windows.
Also consider common household appliances that can block a wireless signal. Microwaves, cordless phones, TVs and baby monitors can all impact performance, and refrigerators in particular can stop a signal in its tracks. If you’re noticing signal loss, you might try moving your extender and/or router away from these appliances, if possible, to improve the extender connection.