the lcd display on my handsets are breaking up/empty lines across display, so bad on 1 that it is no longer readable...kinda defeats the whole call id, etc. appeal...what is causing this?...i live on fixed income so i need to know if there is something i can do myself to fix this? if not, by a shop?...or is it like so many other products, dispose/replace?? hope to hear from someone soon...thanks