Best answer by TripleHelix
Hello @cb1958 and Welcome to the Webroot Community!
I get messages from my ISP once in a blue moon about such issues so if you know ALL your devices are clean I would reset the ISP Modem and if you need to know how to do it, it would be best to call them. If you want a security check please Submit a Support Ticket and ask them if they see anything odd going on with the device you submit the ticket from.
Thanks,