I'll get a voice mail alert on my 9700 (v220.127.116.111), but the phone never rang and shows no sign that a call was even received. When I check my voice mail, there's a message and someone has indeed tried to call me. When I call them back and ask if it ever rang on their end, they say, no, it went right to vm. One friend told me it happens a lot and so he just texts me now.
This has happened several times in several physical locations, so I don't think signal strength is an issue. In fact, the BB is on my desk (where it usually is during the day and where it was this morning when I "missed" two calls) and the status shows a signal strength of -70db and 85% battery.
I actually heard, in PC speakers, the interference from the BB's radio and picked it up to see if I had an email or something, but nothing. A couple minutes later, a vm notification arrives. Apparently, the radio sound I heard was the phone call that never caused the phone to activate and ring!
Naturally, when I call the phone from my land-line to test it, aside from a seemingly longer than normal delay of dead air after dialing, it inevitably rings.
I've tried a battery pull several times, but this has no impact.
As an aside on a likely unrelated, but worth mentioning note, every now and again when I receive a new email, I will click to open it and it will be the previous email. My initial reaction after the first, say, three times, was that I was fat-fingering it, but it's happened enough that I'm thinking it's not me anymore.
Any suggestions or insight would be appreciated.