|Thanks for the thank you.|
"This area is prone to power surges during thunder storms.
That's more than likely the cause of the malfunction."
I was taiking about plugging in the AC to DC adapter at the wrong time, but, yes, that's quite possible too. Lightning strikes in particular are more likely to cause damage.
You should have the computer and everything that plugs into the computer that connects to AC directly, or indirectly via an AC to DC adapter, and the cable that connects your modem, or combo router / modem, to the internet, if your computer is connected to a modem, or a combo router / modem, via a network cable, plugged into a device that protects against damage caused by power spikes or power surges, but unfortunately those caused by a lightning strike can get past anything if the device is plugged into AC, sometimes even when the device the AC is plugged into is switched off.