And if Google representative says AGAIN there is no Sandbox, don't you think you should start looking into the other direction?
That quote above could be an excellent starting point.
So, if you (just for the fun, of course) begin with the "No Sandbox" theorem, what could be the possible answer(s) for the effect observed?
- Something on the page started getting its points, due to age or some other value
- Something off page started getting its points, due to age or some other value
- New addition of some off page elements
- ...Anything else you can think of in that direction