Hello plugin
I too had a strange failure with my Futaba 2.4MHz controlled plane. It was on my SPAD Flying Lawnmower. The plane was about 4 years old and had been using this newer radio for about 18 months. I lost all control during a climbing turn and the plane slowly dived into the ground from about 50 feet up, with no controls working. Afterwards everything worked. After a few weeks of thinking about it I replaced the On/Off switch with a heavy duty switch that also used gold plated contacts and cost about 2-3 times that of a standard switch. For good measure I also discarded the Rx battery and some extensions and a mixer for the elevons. The receiver is now my new Spad Biplane and all has been well. In the absence of any evidence I am putting all the blame on the On/Off switch and am slowly converting all of my planes to use the better switch. I would not place the receiver on top of the battery like you have. I once had glitches with one of my older Futaba radios and eventually I eliminated them after I put about one inch between the battery and the receiver. I currently have four of the 2.4MHz receivers on 4 different planes. On all of my planes the radio antennas are much better separated and at close to 90 degrees from each other in their full length than is shown in the photo you provided. Many of my planes use aluminum angles or square tubing so I have to be very inventive to keep the radio signal from being blocked. Buena suerte, amigo.