In the past couple of weeks our pair of BT8500 phones have started cutting off callers after about 5-6 minutes. The connection is lost - neither party can hear the other - but there is no dial tone. It's like the connection is still open but not passing voice.
We've confirmed that no buttons are being pressed whilst in the call but that makes no difference. All other phone functions are OK.
Everything as been just fine with these phones for the past few months except the last 2 weeks or so.