I have 4 wireless phones, and everyday when I am talking to some one, i will get static. and then it starts getting louder until i can't hear the other person. and when they try to call back, they get the busy tone like im using the phone, but i'm not. and if i try to call them back a few minutes after that, when i pick up the phone, all i hear is lots of very loud static. usually it takes about 10 minutes to go away until the phone works again, but it will only work again for a few minutes. this also happens even when i am not using the phone, and someone calls me, they will just get the busy tone. please help me fix this. thanks.