Panasonic kx tg2422w makes a loud buzzing sounds when making a call. The reception and sound seems fine before dialing but once all 7 digits are dialed it creates this buzzing sound that resembles an electric shaver, which makes it really difficult to hear. someone gave me this phone so I only have the one phone with the base. The phone also gives me an option on the menu to use line a or b but I have tried switching between both with no resolution to the noise.