That sounds like the GDPR policy popup discussed in this thread. Once you accept it, does it come back again?
Accepting the cookie does seem to make it stop.
It was a bit of a pain if you were alternating between things in the nether regions of the front page e.g. Other Mac topics, Site Comments, and then pressing the 'back' button to return to the front page, you got taken to the top each time.
All good now though.
(although once the Bloomberg vid's gone from the front page I might well remove the cookie out of spite, just because it was so irritating!)