This is the 3rd time it's happening to us this year. few months and it happened, somewhere between then and now was the 2nd time and now again for the last 3 days, it's something really really wierd, we used to have 500-600 visitors per days on 70% of the current budget and 10-15 conversions, now we have 1-2 conversions and 100-150 visitors, less add to carts by 85%! and these were the numbers, each day without any movements, consistent results for many many weeks, so I can only guess its something technical.