Is this a known problem with the D2G? Sometimes when I am making a call, it is so quiet that I can't hear the person on the other line unless I really concentrate hard on their voice. If I try to switch to speaker, I hear nothing. I know that this isn't "supposed" to be this way, because I can usually end the call and call back, and it will be fine, and failing that, I can at least reboot to fix the problem. The first time this happened, it appeared to be isolated but now it's happening more frequently... it's pretty annoying. Any advice?