At some point during the day, my Droid will refuse to take calls. People who call my number will be forwarded directly to voicemail. Also, the phone doesn't notify me that either (a) I missed a call or (b) I have a new voicemail until I refresh the display in my Visual Voicemail app. I can make calls during this time, but I can't receive them. I generally have three or four bars for most of the day, and my 3G connection seems OK. While calls won't ring the phone, email and other notifications appear to work fine.
Turning the phone off and on again seems to solve the problem. Is this happening to anyone else? Any help is appreciated.