And did you try other make/model sets?
I have just replaced my BT cordless phones with two Gigaset S850's. Initially the phones were fine but gradually both phones when dialing out would drop the call and revert to the dial tone, it has gradually got worse and the only way to resolve it is to either remove and re insert the handset batteries or reboot the base station. This problem has occurred on several handsets over the last few years. I am surrounded by a lot of IT equipment such as PC's servers, printers, screens, satelitte receivers. There does not appear to be an issue on my land line and a corded phone works fine. The only issue that I can think of is electro magnetic radiation interfering with the phones. Has anybody any ideas. Many thanks.