My hands free Binatone 3505 works well during the day but not in the evenings, I hear the person who is calling but they cannot hear me (line is very crackly and intermittent). I have renewed the batteries. The other 2 phones work properly at all times.
Is the base station near a source of interference, especially something that is in use during the evenings? Try moving the base well away from its current position and maybe power from a different outlet as well.