I was frustrated today by the above message every time I pressed either of the C1/C2 buttons. A dialogue box appears on screen with Ignore or Okay options. I also noticed my video downlink to be very flakey. It was behaving as if it was at extreme range, it was in fact in clear sight less than 10 metres away. This behaviour occurred on both of my two flights today. I did a full shut down and battery replacement between flights. This has not happened before and so I tried to investigate later. With the craft on my table and the remote beside it I cannot get the system back to normal. Anyone else seen this issue, anybody got any suggestions?