A brown out is when the voltage drops so low the receiver doesn't work. When the voltage pops back up ('cause now neither the motor nor the servo are loading the battery) the receiver turns back on but it takes a second to get its bearings.

A glitch buster is a capacitor, and in my case at least, didn't solve the issue entirely but did help to reduce it. It's my kid's car and he's young enough that his throttle EPA is 45% at most, so it doesn't bug him.

The freestanding BEC is probably the best bet, or eliminate the Spektrum gear. That's my intent eventually.