The base is working as when someone calls, the LED light is lighting up accordingly. My problem is with the handset. The screen almost all the time is ON and it does not ring. I tried buying a new battery and the experience is the same. When I put in the battery, the screen turns ON (which it should not and was not like this when I bought it) and there's a hissing/buzzing sound from the handset speaker. Keys don't function. Please help.

Lands Phones - Thomson - GE Cordless Telephone 27995GE1