Nokia Lumia :: 900 Stops Sending/receiving Text Messages?

After two or three charges my new (up to date) Lumia 900 stops sending/receiving text messages. The map app also appears black at every zoom level. However LTE signal is fine, I can receive phone calls, and use data to search for near-by restaraunts and overlay results over the black tileless map.There is no visible indication that the phone is no longer sending/receiving txt messages.. other than an angry girlfriend.Once in a while I open up the map app to see if its loading tiles. If not, I reboot the phone and everything returns to normal for a few days, and then problem comes back. It has been this way since I bought the phone three weeks ago.