i was flying my avisar and took off flew half a pattern, but i lost i controal with the plane and it crashed. the antena wasn't near a servo or anything metalic. it was in range, i have a narow-band raido, the batt and all servos were pluged into the recever, i had a full bat, and tx charge, the reciver and bat were mounted in foam, and i just can't figure out what happend. i tested all the radio equipment later in my workshop and it worked fine. any ideas?

I have had it happen, too. Sometimes there are spurious radio signals that cause interference. Once I had a transmitter with a faulty component, and it would throw glitches. Check the condition of the donnectors that connect the batt pack to the circuitry. If they are spring leaves, they get dirty. THey lose tension. Polish them with a pencil eraser and a soft cloth, spring them a little tighter, and try again.