Power cycle your phone and if it switches to vibrate...
there is something wrong with your phone...
mine actually takes it a step further and switches to vibrate periodically switches to vibrate all on her lonesome, which makes for an interesting escapade when my gf starts wondering why i'm not answering my phone... :p
but when I power cycled the demo model at the Verizon store today, it did NOT switch to vibrate when it rebooted... figures the store get a completely functioning model, lol...
also, since Monday, I have now had 4 random reboots, and my visual voicemail still doesn't work... not to mention from the blackberry app world, it states that blackberry podcast, blackberry protect, and countless other apps are not available for my phone... =/
I know I'm missing some other phantom problem, I just can't remember it right now, lol...
other than that, I actually really love the phone... form factor, slim, the battery is not all that bad from my 9650... that guy I had 2 spare batteries running in OEM charging units constantly...
*just remembered what I forgot... the sound for the trackpad has a tendency to disappear on her own as well... I have to make a call then it'll magically come back on...