Cordless phone hissing several seconds before I can hear
I have a dual set cordless phone that we have used for close to a year. The base is in the bedroom and the second phone is on my sunporch. In the last week or two, I have noticed that when I answer a call on the sunporch, I get a hissing sound for several seconds before I can hear the party calling. The party can hear me fine if I tell them to wait. I do have a wireless network, but I've had that for several months with no problems until now.
I can swap receivers and still have the problem, so I am GUESSING the problem is not in the handset or battery. I have also tried testing this by calling the house phone with my cell phone and can't duplicate it that way. Before I go out and buy new phones, I wonder if you can suggest any other possible solutions (after all, there's no guarantee that a new phone would not have the same problem).
Thanks for any help you can provide.