Last week a lightning bolt came out of nowhere (SJC is near top of list for strikes) to burn our modem, wifi, and PC internet connection. The provider replaced the modem, the service guy was nice to hook up (after much grief) a wifi that a good friend had given us, and we sent the PC off to our usual technician friend to replace the burnt part. All seems to be working normally, again.
(The first time I posted this, on QBT, was the wrong spot. Here's where it belongs.)