I was typing a text message today and I got an error message saying that the (keypad) program had to shut down due to an error (I can't remember exactly what it said). It shut down and afterwards I tried writing the text again but I couldn't see anything that I was typing the message was just blank. after messing about with it a bit I turned the handset off and on and it sorted itself out but it's a bit annoying I had to do this, is this a common error and is there a work around?