We hardly used our machines yesterday - were out all morning and busy in the afternoon, but had high use. The attached display is from my personal system - no other devices. I haven't been to the website listed as taking most of the usage. We do use Malwarebytes.

As I say, we'll just have to see if the password change helps. We've been getting the odd spurious day like this. Usually it's major Windows updates - but every now and then somehow we can't explain. This time we happened to pick it up quickly.

But we'll see if changing our router password helps.

Thanks