Good day- I have the the Panasonic KX-TG2711SA DIGITAL CORDLESS PHONE (3 handsets) When I phone i keep on getting cut off with (IN USE) know one in the house picks up the other handsets - this is very disturbing getting cut off all the time talking to people. I have looked in the Manuel and cant find what is causing this. I have had this phone now for one year. please help. This happens to all three hand sets