Having looked on several internet websites I would suggest that this cutting out probelm seems to be quite widespread.
I too have had this problem. Initially I changed the rechargeable batteries and the problem disappeared immediately, only to return after a few months. Now I'm REALLY fed up and have decided to replace with a consumer magazine best buy..... not a BT Synergy 4500!
Pee'd off BT Synergy 4500 ex-user!
April 2010