Could also be the exact opposite (experienced this with consumer grade electronics based on microcontrollers often enough):
Because of the large capacitors, voltage from the power brick kinda “ramps up” when it is plugged into the wall. The device/its MCU/most specifically its clock circuit however prefers a hard edge of power being turned on, to reliably trigger its power on reset circuit/oscillator.
You can think of it similar to a pendulum/newton’s cradle/metronome - they also prefer one decisive push to get going reliably.
Unplugging the brick for a longer time is still worth a try, but it could also be this.
Unless someone would stumble upon a combination of microwave magnetron that “just so happens” to fit a satellite dish LNC mount. I can neither confirm nor deny that such combinations might exist.
It certainly would seem a very good way to impart… “energy” into all and sundry besides the intended target, and as such horribly dangerous and irresponsible.