We have a Bt8600 which has worked welll for two years. Suddenly it has stopped ringing for an incoing call. Checked volume ok and do not disturb is not on. If you know a call is being made you can answer and it connects. It logs missed calls and you can make outgoing calls. just not ringing or connecting to answer machine.
The same thing has happened to me. The handset on the base still rings for incoming calls, but not on the remote of the twin pack.
I have also experienced callers on my address list needing to announce themselves again, which is annoying. I am also fairly sure that I haven't set a PIN, but now I cannot access this facility.
Not much help, I'm afraid, but plenty of sympathy; at 7 months on, whatdid you decide to do?
The only thing I haven't tried is a reset - does the BT8600 Advanced Call Blocker have one? Strangely, I have just put Handset 2 on the Handset 1 base and it rings, but then the Handset 1 doesn't ring. This suggests a weak wireless signal, but I do not get an "Out of Range" message which should alert me to this.