Heads Up: ISPs may be testing in a signal through home routers that creates vertigo on command. "Glitch" planned for election day? The signal is a digital pulse about every three seconds sent through a home router even if Wi-Fi transmission (2.4hG and 5gH) are disabled. The vertigo effect happens right away and gives a disabling sense of dizziness. Local doctor here told me she's seeing an unusually high volume of vertigo cases. The signal was seen on an RF Meter. I experienced it twice and traced the signal to the router. I  don't yet know the frequency. This is provided under, "SEE SOMETHING, SAY SOMETHING." If you experience a sudden vertigo in your home, unplug your router and see if the feeling goes away.