Nv mx 3000 panasonic goes but wont record will play back rewind but wont record red flashing box symbol have left open for condensation to clear but still prob also when plug mike into jack keeps cutting out and in

Just look for the reset button or go to menu then select factory default setting .If not have reset button just take the battery of the camera and then reinsert the battery purpose is to erased the memory setting before then check whether it is perfect sometimes the battery gets leaked and does not get work properly removing the battery and reinserting also reset and I hope it works properly as it was working before.

Hope it may help you;

Regards;
VOTIT