Same thing going on with mine after the GB update. My issues so far:
*Clock rolls back 1 hour every morning...auto fixes itself during the day
*Random cell service drops until I restart
*Music will start playing randomly 4-5 times a day. When I removed all the music, it now displays a "Selected Playlist is Empty" randomly throughout the day.
*Phone calls won't work sometimes
*Voice mail indication when the above happens, It won't tell me I have a voicemail until a call actually rings through on the phone and they leave a message. At that point it tells me I have a dozen voicemails!
I plugged my phone back in today and it seems that the LG Update Tool thinks there's a newer update that my phone doesn't have ??...I'm trying it now. Regardless a fresh firmware update might help the issues. I'll report back in a few days if all is well.