Bought Phantom mid-Nov. No problem in any way but did all the updates as recommended. Also recalibrated sticks. It has flown great for two/three days since. But, today, despite full battery charge, it started to sound klaxon and then gave me the Communication With Battery Issue and then Invalid Battery signal. I did the reseating of battery, turning everything off and then back on, but still get the invalid battery signal. I have version 1.05. Suggestions?