FCBO webpages randomly redirecting, sometimes Norton, sometimes asking for CAPTCHAs

@Joeychgo and anyone else:

Anyone getting random page re-directs on here?

It's happening randomly, but when it does, it happens 3-5 times in a 15min period. (then it's OK for days/weeks)
Seemed to happen most in the cars-for-sale forum - but can't really confirm that with data.
It's happening as I am simply viewing a page, not from clicking any links.

Sometimes it's to a Norton antivirus expiration page (I don't have Norton)
Sometimes it's a few different CAPTCHAs, the one below...

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Author: fury fan