Switches can be one big airplane destroyer. The switch itself can cause you heartburn. The connection between switch and battery is a real place for trouble.
I suggest you use heat-srink tubing over the batt-switch connector. In my larger and /or better models, I splice in a second switch so there is a double switch routing for those little electric fellows to travel. Then when the engine is running, and the model is well held down, do a "Mag Check" (real airplane thing for recips) by switching one switch off at a time. If the radio fails with a switch off, then you know trouble could happen. Your choice on just how brave you wanna' be!

At the very least, tape over all those electrical connections with a good sticky tape.