Usually I am unable to listen to newly received voicemail without restarting my phone. I can go to the proper screen but the message does not play. This is very annoying.
Same answer as answer for http://community.vzw.com/t5/DROID-Charge-by-Samsung/Problem-with-video/m-p/688711
Sounds like your data connection went dorment, try cycling airplane more instead of restarting, if it works then that is your issue.... For some reason the network keeps doing that with the connection.
Switching to airline mode and back had no effect at all.